Nice, those sound like some good strains. I got 2 DNA Blue Widows as freebies but they both came split in the pack. Sucks cause those were the freebies I was most excited about. These are cuts, correct? What is that other seedling you've added to the mix?
As far as the temp argument, this is a good chart to look at
I think higher temps are better as long as you keep it in the green zone of that chart, at least for veg. I've read you actually need higher temps to get full benefit of CO2 supplementation but never ran CO2 personally. Latter part of flower you'd want to drop it down some to avoid mold. Also, IME buds seem to not like to finish in high temps (90-92 in my case and not of my choice), they seem to like to foxtail and keep throwing new white hairs.