I have a 5hp Nissan 4 stroke, long shaft, but I'm not sure it's the 25" extra long shaft like a SailPro. I also have a high thrust prop. It does just fine on the original aluminum Garelick 2 stroke lifting mount. Powers the boat to hull speed with no problem. The weight of that 6hp should not be too much more, as it's the same powerhead, just a differently tuned carb. A bit more weight of shaft material etc.
I suspect even a 3.5 hp 4 stroke would do the trick. If you regularly motor in strong wind, more hp is good to overcome windage. If you regularly motor in fast current, nothing will do anything for you once you hit hull speed through the water. If you're bucking a 5.5 knot current, then you're at hull speed through the water, regardless of speed over ground. More power will only let you go marginally faster, while creating taller bow and stern wakes.
I have friends with Torqeedo motors on 192s. Heck, I know people with Torqeedos on Precision 21s and O'day 222s. Our biggest issue at the lake is getting home when the wind dies, not blasting home in heavy winds.