my 2 cents on
Vision: i noticed that i was signing more of the top guys i could see after just my 1st 10-win season (also made school's first-ever playoff appearance). I wasnt necessarily 'seeing' better recruits, but it seemed like i was able to sign some of the better guys i could see. this trend increased in my 2nd and 3rd 10-win seasons (also won CC and advanced to 2nd round both years). This was my first recruiting cycle after 3 consecutive 10-win season, so my vision had increased, i could 'see' better guys. But it seems like i was able to sign fewer of the top guys i could see, and because i wasnt targeting the lesser guys from the get-go it seems like i actually ended up signing a worse class this year with my increased vision than i did with my lower vision last season (because it seems like i was able to ink a higher % of my top targeted guy when i had lesser vision)
So i think the important thing to think about is overall team prestiege, it seems to be on a sliding scale every season and it seems to be relative to other teams. So you want to get as many wins as you can as early as you can and remember just just because you can see better players doesnt meant they will want to sign with you over as you grow your team vs a perennial powerhouse.
Ive run the 3-4 almost exclusively the last 3 seasons and swear by it in just about every situation. I favor SPD over just about everything else, but to differentiate between ILB and OLB, higher TECH guys tend to be OLB for better pass coverage, higher GI/TAK guys as ILB. the criteria can also be exclusionary, like if i have a guy i signed who isnt necessarily a perfect fit at either ILB or OLB, if his TECH is too low i will stick him at ILB regardless, and vice versa. quality depth is the key for 3-4, 8 is good but the 4th guys get very very little PT so it is important to have a good spacing between classes, 2 in each class is ideal i think.