Would you rather have bags under your eyes or muscle spasms and constipation?
I’m being somewhat facetious, of course. But, it may eventually come down to that. I recommend that you try adjusting your salt/electrolyte first. It’s probably water retention and increasing salt helps retain water a bit, so decreasing it may lessen that. Or maybe it’s genetics and just part of your aging process. I have bags under my eyes (I’m 74 so I guess that’s to be expected to some degree). I don’t like it, but then there are lots of other age-related changes I don’t like and can’t do much about. I had the eye bags long before keto.
I also had severe and persistent night cramps in both my feet, ankles and legs right up to my crotch. I’ve resolved the cramps mostly, but not entirely, by using a simple salt mix every day. I call this mix my electrolytes: Edmonds Real Salt, French’s No Salt and ordinary epsom salt. You could do something similar to manage your spasms and constipation and over time figure out a mix that resolves those issues without exacerbating the eye bags. I also mix Himalayan salt in water and drink that during the day. I’ve found that although both potassium and magnesium are necessary, a lot more sodium helps the most.
PS: It might also be a collagen issue. You may find that increasing protein helps. As we age, collagen in the skin tends to decrease and those eye bags are skin that isn’t elastic enough to stay up under a little water pressure.