I only trim the ones hanging down below the top edge of the pot, and the ones with leaves touching the soil. Mainly just because it makes it easier to water without splashing nutes on them when feeding.
I think your worrying way to much about your temps. I will be starting week 10 on Weds, and my temps have been in the 90s every day since sprout, with a few days over 100deg. and my girls just take it in stride.
These were taken three days ago.