Try shooting for 5.4 ph for rooting, once I dropped my ph to that range things seemed to speed up. I've read the slightly more acidic solution is beneficial to cloning for a couple different reasons. 2 of the ones that stuck with me are that bacteria don't like that lower range as much and the more acidic solution promotes tissue scarring which is where roots shoot from..I haven't done much research into either but i can see it being possible. Once i had 75% roots i started shooting for 5.8 again.
Res should be 68-72, ideally, mine go up to 75-77 sometimes if i don't ice them. I've been running hydroguard the last couple weeks which seems to help keeping the bad shit i was initially dealing with when the res's got warm at bay.