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Tryfan said...
2 + 1 = 3
If you haven't spent much time on a LB, and used to a thruster setup on your SB, try larger thruster set like S9 (shapers). If you can't get em over there or want to get close as to thruster just increase size of your side fins to match centre. If 5's still don't cut it try 7's with the 6.5 you have (shapers also do S7's for LB box now).
Definitely slide it back as everyone else already said (always have the front of base of centre fin behind the tips of sides, otherwise you may as well ride as single fin).
Long term you may learn to love the 2+1 setup on a bigger, rounder board but short term a similar fin setup that you are used to should help you familiarize with the different style board.
Hope you are getting some good waves to test it out in mate.
Thanks Scotty, an expert on the subject if I have ever seen one

Waves have been ok of late over here

I will post a pic of the set up Im going to test soon