Hooda
I have been surfing the 9'6 Allwave for the past year...
yesterday I had a chance to borrow an 8'10 Allwave... I was immediately comfortable on it. It felt like home.
My point is... Allwaves are stable for a reason.... the design works! The way the thickness is carried to the rails, the bottom concave and the fuller nose and tail give it an incredible stability.
Since you have already been using a board of 143 liters... you know that you can "Float" ok on that... it's the width, rails and design that make your board too tippy for you liking.
The 9'2 would certainly be VERY doable for you, at 160 ltr the float will be much better than your current board and at 31.5 wide.... you will LOVE the stability improvement.
I am not comfortable on any 29.5" wide board (except a race board design).... but I am SUPER comfortable on the 8'10 Allwave at 97 kg... so comfortable that I was thinking 8'6... but I'm sticking 8'10.
I had actually ordered a different board... full carbon, new design by a popular brand... but after riding the 8'10 yesterday.... I called and changed my order to another Allwave.... GREAT boards for almost any conditions... and I LOVE how tough they are. An added bonus? I found that while the 8'10 was incredibly loose and drivable... it is still great to nose ride!
I will add a picture I took of my test paddle on the 8'10. It was windy and choppy, Full wetsuit, gear pack, paddle, etc... so my total weight was around 103 kg on board.... immediately relaxed enough to take out the camera and take pictures while standing idle, in bumpy water.
9'2 should be solid for you.... if you want to push it... you
could go 8'10 and probably find it easier than your 10' x 29.5
ps... I bought my first Allwave without ever seeing one in person.... sometimes we don't have the luxury of demo's available.... maybe if you post your location, some breezer will let you try one.