increasing and consolidating standing rigging size

My boat has a mix of standing rigging, lower shrouds (two on each side) are 3/16" wire. The rest are 7/32". I have Sta-Lok fittings all around.

I am doing more and more ocean sailing and would like to go up a wire size (seems like a good idea and would probably ease my mind a bit when the going gets rough). Up one wire size would mean going to 7/32" on the lowers and 1/4" on everything else.

But I'm wondering if it would be wise (and OK) to go up to 1/4" all around. That would be going up *2 sizes* on the 4 lowers and up one size on the rest. This way all of my standing rigging would be the same diameter wire and it would simplify my spares quite a bit. (both wire and fittings).

However I understand that going up *too* much can overstress the boat fittings. is going up to 1/4" on the lowers too much in this case?