In addition to my above questions, any other suggestions or critiques are welcomed.
Okay… you asked for it…
Kidding. Just kidding…
If the room stays 80 or above then you don't need night heat. Just remember to have a plan for fall.
The basking bulb only needs to be on for about 12 hours a day. I like it to come on just after sunrise and go off just before sunset this time of year. In winter I set the timer for about 12-13 hours of "day" light.
Using the lid and cutting out a hole for the light will definitely help keep it more humid. Just be careful to watch all the temperatures, and don't let the heat lamp get too close to the plastic lid.
He might be staying over on the other side to avoid the red area. Your new bulb will answer this question for us.
The food you are offering all sounds great. I would not feed any fruit or fruit tree leaves, and I don't think lilac or lavender are okay to feed.
It is normal for them to take cover during the mid day heat. This might also help them avoid the strongest UV rays of the day too. No one is really sure if its one or the other, or both, or both plus some other factor…
He also gets some supervised floor time in the evenings so he gets plenty of exercise.
The above quote is a very dangerous practice and those of us that have been doing this for a while strongly recommend against it. Most people get defensive and argue, but you don't seem like that type of person. Everyone thinks it is safe and that they are being super careful, right up until the day when they realize they were wrong. We argue, fuss and fight over this all the time, but we all just want to see all the little babies thrive and grow up. Some people just have to learn this lesson the hard way, but I try anyway.
Don't let your tortoise run loose in the house or outside. Design and build proper and safe enclosures both indoors and out, and have your tortoise get his exercise where he will be contained and safe.
While we are broaching this subject and trying to prevent disasters, it is worth mentioning that dogs and tortoises need to be kept separate. If you have a dog, never let it have access to your tortoise. The kindest, nicest, most mild-mannered, loving family pet will eventually chew on a tortoise. Its just what dogs do.
Hope these things help!