I saw this video:
And noticed he found the longer fuselage and bigger stab could pump better, as he got more glide between pumps, because of more lift (he said).
It does not sound quite right.
My take on this is, the longer fuselage and a bigger stab, will give you better pumping leverage, so you increase the speed much more efficient when pumping - thus you got better glide between pumps as a result from this.
As a bigger stab does usually not lift more, in stable glide - on the contrary, it maybe lifts down, reducing overall lift a tad.
The downside of longer fuselages and/or bigger stabs, is the complete foil will turn slower and feel a lot less lively, not good...
Except for beginners maybe.
What do you guys/girls say?
Peter