ouch, 86-88. are you in a cabinet? you need some fans or something. I don't know how your grow is set up so i'm not sure why you are getting that high. I know i caused a little heat stress once not because i didn'thave a fan, but the fan was having air flow blocked. make sure your airflow is where it counts and isn't obstructed.
I use two 70cfm fans to keep my 150w at bay from 9" from top of plant. Fans directly under light.
you ahve 16 leaves at 3-4"? Does that mean you have 8 pairs of leaves, 8 nodes, at 9 days? That seems kinda big for that size. Are you counting the main leaves and the secondary growth? If so, just count from the main growth. You are way to early to flower btw. Like i said, depending on how much you want to yield, which could be regulated by how big your light is, you might want to flower that at 1ft. gets 3 ft tall max. Thats a good size plant for an indoor grow. Thats what i'd be aiming for if i was growing bigger plants. You mgiht want to go till 1.5ft since you can't always count on the plant to triple.