If you're only getting 15 man classes, you're either wasting time going after recruits you have no chance of getting, or you're spending too many points with sending the house and head coach visits. I've actually gotten commitments out of players after a single phone call. It's not going to happen all the time, but it's possible.
If you don't have enough points, you can either
1) win a few more games
2) allocate a greater percentage towards recruiting
Also, you have to target in-state recruits if you want to get a lot of guys, especially if you are not a high prestiget eam. In-staters only cost 15 points to "send the house" versus something like 24 or 32 for out of state recruits. I can't stress it enough...recruiting in-state is crucial.