So he's probably really unsettled from the new house, new bedroom - it's all a bit scary.
Add into that his routine has changed and yes over tired, it's really quite understanding that he's had this hiccup. But that's all it is, a brief hiccup. Give him some grace and you'll get his sleeping back to how it was.
Given all the change, I really wouldn't change cut to bed yet. It'll add to your problems. Plus the change is best done at a time you think it's right, not because your hand is forced due to poor behaviour.
That's all we have here. Poor behaviour and a bit of nerves cos of the new room. It's not a sleep issue, it's a behaviour issue.
So firstly, get his routine back to normal. As structured and 'normal' as possible.
Then make the room as non-scary as possible. Embrace open doors and night lights on. A new dimmer switch for the overhead light might help. Easy to fit and cheap.
Tell him off about launching himself from the cot. Be cross about it. Treat it as any other poor behaviour that is dangerous. Establish instant rewards for staying in cot - you can have a biscuit when in morning if you stay in your cot, for example.
Once you've got all this in place, I'd start the process of zero tolerance of bad bedtime behaviour rapid return.
Develop a cover-all mantra that you repeat at bedtime. "It's sleep time, you lie down quietly to sleep, Nan night". After bedtime routine, put to bed, say the mantra, leave.
Give it a few mins. If he's shouting, if he's not lying down, back in. Repeat the mantra, leave. Repeat, repeat, repeat. Every night, every nighttime wake up, every nap time. It's about consistency. It's a battle of wills. It won't take long if you're consistent. Less than a week.