your fin choices are great. I felt that the board worked awesome with my 9,2 Reflex III using fins from 45 to 47cm. I would not replace the 8,6 by a 9,3. Try to get a light 9,2 or 9,3 additionally for the lighter days or flat water (easy chop) conditions.
In total the 117 wide and in 2013 the 117 covers a wide windrange for someone in your weight class. You can try to get some kilos off. That's perfect, especially when sailing in a shorty. If it's really light you can push your gear by a big powerful fin. A 46 should be fine!
Get your straps all the way back and use adjustable harness lines.
Overall you can have perfect speed with sails from 7,8 up to 9,2(9,3) on this board. But please, don't replace the 8,6 by a heavy 9,2. If you will find a perfect 9,2 for the 117wide it can happen that you prefer this set over the 8,6 combo:-) You are tall and you can handle the 9, 2 easily.
Hope it helps,
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