Even if your a heavy weight, I think the iS135 might not be to much fun with a 7.5m as its such a big board. The iS135 is more for 8m to 10m light winds. The iS122 will feel much nicer with a 7.5m & 8.5m and will be more controlable when the wind picks up, but still be v-good in light winds.
cheers
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