The 50 Meter Pool

Okay, one of the side effects of training for Triathlon is that an injury doesn't actually reduce your training time.  I haven't run in over a week, but I've biked a bit, and I've been swimming a lot.  This week, I've done swim workouts 6 days out of 7.  This has allowed me to work more variety into my swimming than usual.  My typical swim workout involves slogging through somewhere between 1000 and 2000 meters, freestyle, at a moderate pace.  That, after all, is what tri requires.  This week, I've mixed it up.  I've been working on back stroke, breast stroke, and even, in moments of insanity, butterfly.  Best of all, on Tuesday morning, I got to swim in a 50 meter pool.  I may be fooling myself, but it feels like my mechanics have improved more in the last week than in close to a year of steady work.  This raises a question about cross-training.  I've gotten quite happy with a constant routine of rotating workouts.  The problem is that I've hit a plateau.  Should I be rotating week by week, focussing on one thing, then the other, etc.  Max, what is your experience??