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Subsonic said..Its 3.75 degrees of rake on the original, so you want to be using the minus shims (unless you like lots of lift). Most people i know are getting around with 2.25 to 2.75 degrees (using + shims with the -2 stabilizer), so you want to use either the -1 (which gives 2.75) or the -1.5 (which gives 2.25)
i don't know what made starboard decide they needed to have the original 3.75 as 0. I guess they just like to be different/confusing Hopefully i haven't stuffed the maths either.

Personally I think the confusion arrises when we start trying to use 'actual' numbers, they are irrelevant, what are the referenced to?, you can't compare them to other brands so it's pointless. Just calling the rear stabs Original (0deg) and New (-2deg) makes complete sense no? Then the only question to answer is, which stab are you running and what shim, super simple, no weird maths that can be interpreted differently if you're using the 'real' value or the arbitrary one....that's actually on the stab. Just my opinion though.
@Manilo, My other comment would be, if you want to be fast upwind you're going to be uncomfortable downwind as to be fast upwind you need to run a fair bit of lift, particularly when it's light. Personally I used to run up to -1.25 (SBRef) (also custom shims) but most often -1.5 unless it was super windy, so -2 stab, +0.5 shim (or old stab with a -1.5 shim). At the time most of the others (Grae, Will etc) were too but things may have changed in the last 6 months, I didn't race much last season and their level has obviously gone up since then.
Downwind speed is a tricky one and quite hard to explain, you need to have a really good feel for apparent wind sailing and moding the rig. Basically sometimes you have to sail higher for a bit in order to sail lower and faster, it's very easy on the IQ rig to get stuck/comfortable in that 19-22kt downwind mode. Once it's over 12 kts you should be comfortably be averaging 23+ downwind and 25+ in the gusts, more when it's high teens, low 20's.
Also, get the 900 wing, it's the pick in everything (windward/leward racing) unless it's super light and you're super heavy. Even then that's debatable.
There have been lots of posts in the past that cover all this stuff as it's all been known for a while now, you also need to pay careful attention to foil mast rake, mast base position etc.