4/5 or 3/4 or 4

Upgraded to 4 this season even though I had an injury plagued first season as a 5 last year. I currently ride with some really strong 3's and 4's. Lately, I've been finding myself at the front of the group and a lot of times setting a pace that drops all of the 4's I ride with.

Honestly, I don't really care about winning a lot of races I just want to get stronger, become more aware of tactics, and become a better rider in the pack.
In TX we have a crap load of early road races this time of year and I'm trying to figure out which category I should race in.

Thanks.