Not achieving goals, adding more workouts

After almost a year with Club Wolverine, I don't feel like I've achieved any significant time drops.  That's not to say I haven't accomplished anything, I've learned a lot and achieved an Olympic Trial cut in the 100 Backstroke.  I went from a 1:01.40 to a 57.44 in a few short months.  I had a number of meets where I swam 58 second backstroke races, the best being a 58.0x at the Pro Dual 1 meet in Ann Arbor.  My performance in London of a 57.73 was not impressive to me.  It reinforced some concerning facts I've mostly kept to myself.  I don't feel as though I'm working out enough and the workouts we do swim aren't as intense as I'd like.  I feel I need to either add some workouts or sets myself or join the Middle Distance group.  Admittedly, the Middle Distance (MD) group is beyond my current abilities for a few reasons:

1. They're staggeringly fast, not only at short distances but 200+ meters, they just never slow down.
2. They all swim freestyle, I would choose to do Backstroke and therefore not be able to keep up
3. The coaches don't think I can handle the workouts, they're partially correct.

I'm running out of time to make a big change like this before Trials.  Today I did some additional dryland and a P90X ab workout.  Just slightly increasing my workload for now while I consider my options.