First Grow - Runtz

Yes, If your plant starts getting so bushy that no light is making it down to the floor through the plant, it's time to “clean” the bottom of the plant. First start by removing any tiny growth tips on the lower part of stems that will never be able to reach the light anyway.

The ideal temperature for drying cannabis should be between 60 and 70°F, with a relative humidity for drying cannabis sitting between 45% and 55%, so if you're at 68 °F now you're still in range and it's not too high, just make sure to not go over 70°F because If the temperature is too high during the drying process, it can cause the buds to dry too quickly, leading to a harsh smoke and undesirable taste.

There's nothing to worry about at all, every plant grows differently and if both plants are healthy then it's going to have to do with different phenotypes, one of them must have just produced more trichomes.