You can train yourself to get used to paddling just about any way you want, but there are good reasons to train yourself to do it the logical way. When you are paddling with the wind, or no wind, for most people, there is no particular reason to be feathered. Into the wind, there is plenty of reason to be feathered and it will become perfectly clear the first time you try to paddle into a very strong wind. The same is true with paddling while feathered with a strong wind on your beam. There’s plenty to do without giving the wind a flat surface to work on.
I know there will be paddlers who will argue the above and that’s fine–whatever works.
I’m right handed and I suppose that logic would indicate that my right hand should be my control hand. I don’t know exactly why, but somehow I trained myself to use my left hand as the control hand. I can switch, but why mess with something that works.
A sixty degree feather should be enough to deal with paddling into most wind, but there might be times when 75 degrees is called for. With a sixty degree feather, there is minimal to hardly any wrist flexing. It isn’t by pure random chance that paddle manufacturers use sixty degrees on paddles that only offer two settings.
I also might disagree somewhat with what some people prefer about pushing the paddle out of the water with an open hand. That means that you will be opening and closing your hands a lot and that could be tiring too. I do concur with relaxing the pushing hand, but I don’t see the benefit in opening it.
My final bit of advice has nothing to do with feathering, but I very strongly suggest trying some open fingered paddling gloves. Your hands will thank you for it. Hint: you don’t have to spend a wad on official paddling gloves; there are lots of inexpensive open fingered gloves available that work just fine.