Hi there, did you consider a bit bigger waveboard as a one board option as you asked about, like a Grip 86 for example - similar outline to the best seller Grip 82, but just bit wider and thicker, for more volume - will work then in stronger winds than 5.3 too?
or if it´s just a FreeWave you want for light wind days, planing, some waveriding, then for sure the 85 or 95 are the ones - 95 will work very well with both sails, in flat water and waves. The 85 will work ok with the 5.8, better with 5.3 and for sure a bit more wave oriented than the 95. 85 could work for a lot of conditions, so at a stretch a one board option. But 95 will be a light wind option only with your weight.