I would take a Grand Design over a Cougar any day. Look away from the pin weight specs for a moment and take a look at build quality. Go look at the back wall of a Cougar and look at the back wall of a Reflection.
JMO but if you're not constrained by length then a travel trailer will get you more bang for your buck than a 5th wheel. Especially when you're pin weight challenged. Why settle for a smaller 5th wheel just to have a 5th wheel if you can tow a longer more roomier TT and not be concerned about where you park it?
Is there a reason you're concentrating on 5th wheels?
Also buy switching to travel trailers you open yourself up to way more options. Every MFG has way more TT's than light weight 5th wheel models.