OP - relax. Didn't read the whole 3 pages, but first 2 posters were spot on - relax, go out and have fun. Unless your energy use is way above the average, 750W is plenty, in those places. With any kind of controller. Examining the difference in performance btw MPPT and PWM under varying conditions won't help, in this case - it's too complicated to install that much solar all-parallel with PWM.
I've just come from the neighboring state - North Baja California. 490W flat 4 degrees solar with 30A MPPT.
On a dark day with no sun it collects 50-60 AH in February, this is more than I use in a day. The only bad time is when it rains - then it's running 1.0-1.5A, i.e. 1 AH per hour. But it simply doesn't rain in those places in winter. In 3 months there was probably 3 hours of rain total, and not too many cloudy days - I would say less than 20% of time.
On a good winter day it collects upwards of 70 AH - don't know the upper limit since I don't use that much in a day. From previously done research I recall that maximum that it would collect in this place and this time of year is ~90-100 AH.
The bottom line is - 490W flat in winter in this climate zone is filling my batts full, 99 days out of 100, and you have 750W.