I haven't done fundies yet but I did do a pool session with 50Fathom. I didn't expect to be the super star walking through the park and I wasn't. Here's my personal theory for me:
Before my 6 year break in diving, I had pretty good buoyancy and trim. I'm confident this is true because I had buddies who I trusted tell me as such. But back in those days I was rocking the split fins doing flutter style kicks. I wasn't concerned about anti-silting kicks and wasn't bending the knees and working on frog kick, helicopter turns, backwards kicks.
I feel that in making this change to the new kicking techniques and changing how I position my legs in the water sets me back aways. I'm not complaining, it needs to be done. It's just going to take me diving a lot to get it back to where it once was.
I wonder when the next Fundies in Texas will be.