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thedoor said..boardsurfr said..
The i84 needs to be mounted ~3-5 cm further forward than the i76. If it is in the same position as the i76, it's not balanced well, and offers no advantages over the 76. Put it forward more, and it gets you going earlier, and will catch swell better.
This is consistent with my experience too (with 76 in B and 84 in C)
Another option if you cannot move the track forward, would be to move the mast track back.
Depending on style this makes less of a difference than you might think. Hanging in the sail is more of a racing style. If you are upright and dont hang in the sail (freeride style, with your weight over the foil) the position of your mastfoot doesnt really matter much for the distribution of power. Not as much as with racing anyway. Thats why Balz and I and probably others can run only 80cm from mastfoot to frontbolt. The weight isnt there anyway.
Moving the mastfoot does change the stability, moving it further forward makes it easier to not foil out, as you can use your sail as a sort of emergency brake, moving it back frees up the kit for maximum manouvrability!