Ok, I'll bite and chime in on this one, as I am, unfortunately- a light weight (the grass is always greener- I wish I was bigger, but take what you're dealt)...
So, the facts (background): I'm about 177cm/5'10" and 64Kg/140lbs, & have been this exact ht/wt for the past 20~odd years.
To answer your "general strength" Q, Rightarm, I can probably do more chin-ups/push-ups than most: So, Power:Weight I'm pretty good. But, this "feeble overall Power", isn't enough to overcome a 30kt side-wind hitting my exposed bow!
I end up using a lot of rudder (full, most times!) and go very slowly to the point I'm trying to reach, but then DW...!!!
Right- now that I've been paddling for ~2years (1st boat a V10L- did my research & it seemed like a good choice-and it was, but then I had the opportunity to "side-grade" to a lighter/newer Think Legend- the higher volume is not suited to me, but I'm not an Olympic athlete, so I'm happy with all the other features of this ski atm)
So, what were we talking about? Oh yes...
Well, I just think there are a million variables out there for each person to consider, if you're trying to pin-point an ultimate paddler weight/physique to a boat! But, for me, 64Kg doesn't get the best return on "time-put-in", in a full size H.P.S.- if you're only concerned with outright numbers on your GPS! I'd like to think that I'd be faster in a lower volume boat, but my V10L was effected by the wind as well- so maybe one of these newer/shorter makes? That has even less windage for us feather weights? Less waterline to overcome? Who knows- One day I'll get to try one...until then, I just like getting on the water