75% backsin is the way to go 90% of the time imho, and..
Many drivers have the same stated yardage but differ subtlety, on my ALT travels I've noticed......
The L83 X-hot driver is consistently longer by 3-4 yrds with a tailwind than either the Covert or the SLDR...though they all seem to perform pretty much the same in a headwind, with maybe the SLDR just edging that by a yard....
don't really see the point of buying the max driver, it should be gathering dust as the forgiveness on other drivers, makes the meter speed 'gain' immaterial,
Never mind the extra couple of $$ over the SLDR.
Andy
Edit: what did you 'upgrade' from ?