Purple time!

Hey unfortunately vitalink chill is nothing more than a marketing gimmick. There is nothing in it that will protect your plants from overheating. The only realistic way to fix the issue of heat is air conditioning if fans and extractors arent doing the job. Hope this gets you headed in the right direction.

Keep feeding a nute that has some nitrogen in it for another week or 2 until it stops doing its flowering stretch. That stretch uses a lot of nitrogen to fuel the rapid growth of the branches. You should also start feeding you bloom nutes in low dosage to start giving them what they need to be building buds. Once the stretch has stopped you can generally stop using the nitrogen nute as the bloom nutes usually have enough nitrogen to sustain the plant for flowering. You can also lookup the biobizz feeding chart and feed a little less than they say to start with and eventually go full strength.