Your temps and humidity are fine. Ideally the humidity comes down a bit. You want it lower during the final weeks of flower in order to avoid bud mold. A fan across the top of the canopy will also help in this regard.

Two thoughts.

1. Use the hand test. Place your hand just above the top of the canopy. If you can keep your hand there without discomfort then the light is far enough away to avoid damage.

2. If using a thermometer, be sure to put the thermometer just above waist level and be sure that it is shaded such that the light does not shine directly on the glass as this will distort the reading. This is a more accurate temperature gauge.

Those top colas will pick up. Be sure that you don't harvest too early. You can see up to 25% increase in yield over the last two weeks of flower. You wouldn't want to miss that!