General

I've gained 20 lbs and 3" on my waist, but I can still see my abs. How much more will I have to gain before they are no longer visible?

You’re tall so it may take a bit and messing with your metabolism. Lots of ice cream/dairy and carbs.
I used to be super slim and fit. I’m short and was around 105 lbs at one point. I’ve gained and lost on and off over the years but never been as a big as I am now. I used to be able to see my abs even when gaining and now I am considered obese and my belly pops out and there’s no trace or shape anywhere.

I too was tall and skinny very similar to your stats. For me it was around 190 that I began to have more of a pot going on. each 10 past that just enhanced it. Hang in there