He’s in a loose ring happy mouth for flat and stadium, and a 2-ring elevator happy mouth for XC. He’s GREAT in both bits, very soft mouth. Problem is the rings are now rubbing and there’s definitely NO room for bit guards. The 6" is VERY tight right now, so it looks like I need a 7" (as the happy mouths are measured in milimeters, and his current bits are 155mm which is about 6.1" and VERY tight to the point that the rings are pinching, not just slightly rubbing).
Problem is I can’t find a happy mouth of ANY sort in a 7" or a 175mm (which is technically 6.9" just about and would also work). Any other ideas? If anyone can find the happy mouth, great but I don’t see them anywhere. He’s not a huge fan of three piece bits, so next step would be a simple snaffle, was thinking copper or copper-alloy as he really likes the current bit’s taste. Let me know - I’m totally open to ideas. And what is sweet iron like? I’ve never used it.
Okay and looking at bits, I don’t think plain rubber would work since it’s also likely to rub at the corners and irritate his mouth even if it’s a fixed ring bit.
Right now I’m looking at eggbutt and loose ring bits that are 7" with a decently thick (comfortable) mouth. He’s a great horse and very responsive, I just need a nice soft bit that will work w/o rubbing or pinching.....can do w/o the 2-ring elevator b/c I also have a noseband with elastic to the bit that will add a little pressure for XC (hard to explain - it's the CWD Bandala noseband). Right now the best I have found as even a remote possiblity that isn't insanely thin is this (a little thin but maybe the copper will help and the fact that its three-piece w/o a roller or the french link that he finds annoying?):

Even this looks pretty thin to me:

All input is appreciated!!!!