i think 70 is perfect.
yea the clones root well, in about 5-7 days for me and are kind of slow veggers but when flipped to flower the speed up a bit, not a lot but a bit and around week 4 bammmmm
all the sudden its like hyperdrive man. just starts bubbling up buds and never stops. the resin production is off the charts and the leaf to bud ratio is great.
*of all the weed I have encountered this is by far the easiest to trim*