Here's a suggestion that has worked for me, but be forewarned, it may not be everyones "cup of tea"....
Try pantyhose in an extra large size with most of the legs cut off. If you get a large enough size like the "Just My Size" in 3x or 4x there's just the right amount of holding power without crushing your diaper to the point that it will hinder it's ability to absorb liquid. They kind of act like a super light weight compression pant and in my opinion are much better than the Abena Fixing Pants. In addition they really aren't all that hot, even here in sunny Florida, since the material is so thin. There's also an added bonus of them keeping the upper most part of your thighs from rubbing together which really helps reduce irritation in that area.
I know, I know, women's pantyhose!?

But when you get over the stigma and think about it it's just another item to help manage incontinence, kinda like well, a diaper or plastic pants! As I said, maybe it's not for everyone, but it is another thing to try if other forms of diaper support aren't working for you.