Wow, those prices are pretty nice.
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Well, that freedive suit I mentioned seems to be made out of Yamamoto neoprene, which appears to have excellent memory and avoids compression?
One thought would be to purchases one of the stretchy hooded vest for about $100. You would have the hood issue fixed and the stretch material would fill up your existing wetsuit making it fit better. Also it would provide an additional barrier to the zipper leak.
The semi-dry suit you buddy has are nice, but they do tend to be pricey. The 5/7 one piece is just not enough for your area.
I would consider trying the hooded vest idea. Maybe hyperstretch if you need that for the fit. Seems like it could address all your issues in one fairly cheap shot.
Get a tight fitting vest with hood---& wear it over the top...
here you go, for 60 bucks...
Neosport by Henderson 5/3mm XSPAN Hooded Vest SX153MN with reviews at scuba.com
The Aqualung Sol/FX is an 8/7 with integrated hood. I have 30 dives in mine which was bought used with 25 dives (55 total) and have yet to experience any leakage.
Get Wet!