Actually, i'm also wondering why i can't get a stable average and need long warm up time whereas some people don't even need warm up.
Consider yourself lucky. When i wake up I have 28 second averages, after warming up it drops all the way to... 27 seconds. At least you traverse 13 seconds over the course of warming up. What does it feel to warm up like that. Do you just watch the seconds fly off of your average. Thats like going from barely competitive to fairly darn competitive.
As far as stagnation goes in general... I've been stuck in the sub30 range since october of last year, ugh. Time to learn PLL and OLL I guess.