It’s not uncommon to have a lot of debris in the lower when shooting suppressed. You can try to vary things to help get a more complete burn, but you may always have some issues. There is a potential to flash over your powder if the bullet seat depth is too long and powder charge is on the lite side. What primers are you using? Is the powder ok. No exposure to moisture or oils ect...
Keep the 1680 for subsonic and the H110 for supers. While people have used H110 for subs, the burn rates for both powders are specifically designed for certain purposes and I have found that 1680 is best for subs and H110 for supers.
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