After talking to a few of the local gurus they informed me that if you trap out with spin up (in uni-rig) you will have more speed, but you are actually sailing a higher course.
Sailing a higher course is not a problem per se as long as your increase in speed is sufficiently large.
When the winds are light or medium then don't trap and sail deep. Here the speed increase is to little to pay off.
When the winds are higher then medium then trap and sail more faster then you'll loose by depth.
The trick is to find the point in windspeed where you need to switch from non-trap to trap. If you are not sure then don't trap. That is always the safest bet.
In the video it looks like Paul is sailing with alot of mainsail twist. Assuming his heading is sufficiently deep already then he could be better off sheeting in and trapping out maintaining the same heading.
Wouter
