.... but Im not sure if that is helping correct these two issues that have come up, it may be counterproductive, but he is a very energetic horse and the work in the round pen seems to keep him in line.
I definitely don't think that working him hard after he's been caught is going to help you in any way with what he's been doing. All it's confirming to him, is that getting caught sucks, because it means he's going to be worked hard.
I have a yearling Canadian colt who was a jerk to keep in PG13, and he was IMPOSSIBLE to catch or even get near of.
What you need to do is change is attitude about what being caught means. You need to go back to the start for a month or two, and re-teach him that spending time with you is going to be a blast, it's going to mean quality time, it's going to mean bonding time.
There is a post somewhere out there I wrote a few years ago on this forum for someone else who was also going thru the same thing you're going thru but I dont have the courage to go search for it. Feel free to go dig it up.
Start off catching him(no matter how long it takes to catch him-I realize thats part of your issue)and taking him out simply to feed him and give him a good brush. The next day catch him and take out for a walk and find a green patch of grass and just spend time with him. Your routine needs to initially involve something for him like grain and feeding.
The goal of all this, is to change the way he sees you. He will learn that you're a friend, that he gets to spend time with you-that this does not mean a hard workout and a time that is going to be spent in frustration and anger. The second he realizes that you mean friendship, you can start removing food out of the equation. I did this with my guy for a week and removed the feed completely and replaced it with a good groom. I had my colt go from being a jerk and uncatchable, to him coming to the gate and placing his head in the halter himself.
I recently worked and sold a mare who you also could not catch, and went thru the same process. By the time I was done with her, she would come halter herself and I could lead her to the barn without a lead. Feel free to message me if you have trouble.