question about temps and highs n lows

just wondering what is the highest and lowest consistant temp someone has hatched a ball python clutch at? the reason i ask is because i have a hovabator and my clutch temp is right around 89deg f with a peak at 90 and low at 87.5 deg f. because i live in arizona and the temp difference between day time and night time can very alot and so can the temp inside of my bator. either way i know i shouldnt use a hovabator but its what i had at the time so i thought id give it a shot. next year it will be different lol. here is a vid of her on some eggs if ne one is interested :D
YouTube - eggs from my 50% het caramel female x 100% het pied male