kmason - first off, sorry i ignored your site mail, ive been very very busy the last few months. if anyone else reading this has also sent me a sitemail i ignored, i am sorry!
anyway, the one thing that sticks out to me is, your 3 point shooting is poor. you have a top 10 team right now - its possible to have a top 10 team with a weakness in one of the huge categories (reb, 3 point shooting, defense), but its tough to do much better than that (esp when you are looking for top 1).
so, your goal should be to compensate for this glaring weakness. i realize you are going into the CT - use this time wisely, think hard on your new setup, and continue to reconsider it over the next couple days; you need to be ready come tourney time. you can continue to experiment early in the NT if you must but you have to at least be close by the start (on one occasion i experimented hard all the way to the final 4, believe it or not, i was deciding on both guard positions starting lineup and to play all 0s or use my distro pattern, AND whether to play normal or uptempo. i had even been diligent all season, but all 0s was new to me. it ended up working out but its not a good place to be!). before you read on, spend at least 5 minutes trying to figure out how you could make up for your 3 point deficiency.
my suggestion is, change your starting lineup to tolan, neal, shadrick. i am not sure exactly how i'd handle the backups, keller is so slow, id prolly play him at backup sg but consider the possibility of playing your other pg at backup both and going for a mostly 3 man rotation. usually, the opponents backup sf is not a big scorer, so i'd keep your scoring sf in at backup unless you get one of those weird cases where the backup sf just happens to have 93 spd and 100 per :P and even then maybe. similarly, the opponents backup sf is not usually a great defender, which is why you are getting so much out of your backup sf.
you might be thinking, but this will hurt my rebounding! it will, a little, but not much. your sf rebounding will actually improve, and your sg rebounding will take a hit, but they get less rebounds. and the advantages are enormous. instead of 1 three point threat on your starting lineup, you have 2 - that makes your team much harder to defend against. also, your best 3 point shooter moves to sf, which will often result in him having a weaker, in particular, slower defender, which will give him MUCH better open looks, especially for the 3 balls. he should start tearing it up - readjust your player game plan accordingly! this will also take barreto, who is getting 7 points a game on really crappy production, out of the equation - a big plus on the offensive side.
finally, i would strongly consider upping the relative distro of your backup sf. with your backup sg moving to starting sg (if you give my suggestion a try), your backup lineup is in much greater need of outside threat. and, he is putting up GREAT percentages. milk him for all hes worth. you are playing motion, so you do have a limit, but need to find that limit and sit right on it. at 49% and 47% 3s you almost definitely would be better off having him take more shots!
ok, i said finally, but one more. a bunch of people have said play uptempo, but don't listen to them! uptempo may be your best option against significantly inferior opponents (i disagree), but as you correctly assessed, it is not going to help you against the top tier. you are going for a championship, and you don't have your best strategy yet (IMO at least) - so you have to play to find your optimal championship strategy. there is no time to waste running uptempo against weaker teams and losing valuable information! spend at least 20 minutes a game the rest of the way, when you have a meaningful opponent, and make sure you have given your best effort to predicting their tempo and +/-. from there, compare position by position, figure out your strengths and weaknesses, and how you are going to take advantage of them, as well as how you will best utilize your opponent's choice of tempo and +/- (a lot of people don't take the time to do that - do, it is a HUGE advantage).
a final word of caution: don't over think things, don't (over) game plan your way out of a game. you can do 5 times more damage game planning than you can do good. its fine to spend 30 minutes and not change anything. you just want to be damn sure you have the right strategy. figure out their strategy, and make the small change to counter act. if you are making huge changes you are probably shooting yourself in the foot.
good luck!