I currently have an Aqua M3 bivvy with a Superwrap. This is the right size in terms of footprint for me. Its rock solid and I like and use the extra space in the porch created by the wrap and the extended peak created by the wrap provides great protection in the rain even with the door largely open.
Only fault is its now a tad low for getting in and out and worst of all the poles are difficult to fit together and an absolute nightmare to pull apart. This means I dread taking it down in the rain as I struggle on my knees trying to pull the poles apart.

So either i need a good solution to the poles problem (cheaper option) or I sell it and buy something easier to put up and take down. So I am probably looking at a central boss design. So what do you recommend that has the footprint of an M3 with the Superwrap on it, is rock solid and comes with a proper wrap not a skull cap?

It doesn't fill all your requirements, but since buying a Trakker 100T and using this erection system for the first time, I wouldn't ever change back to a pram hood style or other.

Game changer

titan hide xl plus wrap. bit smaller than your m3 but i dont think by a massive amount. got the height though