i would do the following:
1) switch from press. you don't have the stamina, speed or athleticism to run it. you are going to be in a for long year whether or not you switch defenses. however, it sounds like you are willing to stick around for a few seasons so this will benefit you in the long run.
2) for lineup, i would do this:
PG - Decker, Brunnell
SG - Graham, Felder
SF - Smith, ?
PF - Harvey, Stawser
C - Aybar (if you switch to m2m or stay press) or Frazier (if you switch to zone)
Graham was your best signing. he's not a bad player.
take a look at how the successful coaches in your conference & world are recruiting. remember that you won't be able to get those caliber of players yet, but you can recruit slightly worse guys who have good potential.
best of luck to you!