Congratulations to Brian, brian, bryan, and Bryan. I tried the hundred in 5 with the 32 once - I took 6+10, so I'm impressed with dudes who can hit it in 5. I've been bouncing between 24kg for my backoff days and doing either the swing heavy - usually with a 28, but I've tried the 32, or the Get Ups heavy - 32 for 5 is pretty tiring. So Capital Brian D since you're just using "100 in 5" as a swing protocol to augment barbell work, you can probably head north on the bell size whenever it feels good. As long as your recovery stays good by whatever measures you use to gauge such things I say go for it. What's the worst that can happen? You have an extra bell sitting around? That's still a win.
Oh, and I'm feeling the same thing in my lower abs. I'm talkin' really lower/gotta buy me dinner before you can see them lower abs. I thought it was from TGUs, but you're getting the same feeling with swings so I guess it's that.
Bill Been or bill been or Mr. Bean