Yes, I understand after studying more on righting moment. It seems that the extension from center ala' wings, etc. for trapping is the ultimate- but then the official word from Hobie is don't trap off the wings... yet I see it often in pics and videos.
That advice applies to the "backrest" wings on the Getaway and Wave - certainly not to the wings on the 17, 18 and 21.
Here's a point to consider which I found...
Trapeze height: ...As puffs hit, they bend the mast tip to leeward, depowering the main. Because the trapeze wire attaches higher than the shrouds, the crew’s weight counteracts the pressure from the breeze, keeping the mast straight and giving you power in marginal conditions.http://www.nedsailing.nl/Artikelen/Sailing%20World,%20Mills,%20Power%20Trapezing.htm
I certainly wouldn't try any of this with an comptip mast but the all Al one should be fine (I hope
That article is about trapezing on a dinghy (a 5O5, specifically) which has a mast like a limp noodle compared to any catamaran. I doubt you would notice any difference on a catamaran - Comptip or not.