I have a Bristling Buckler, a Wolver Cap, a Wolver Coat and a Hot Edge with UV "Damage Bonus vs Gremlins: High".
Yet when I inspect myself (using that horsehead button to the top right), I see on my Hot Edge that it has "Damage Bonus vs Gremlins: Maximum!"; is this because the Low Damage bonuses from my cap, buckler and coat stack with that? (This would mean if I de-equip my buckler it would become Ultra vs Gremlins, and if I de-equip my coat as well it'd become Very High vs Gremlins. This would also mean that if I had a Skolver Cap instead, the bonus vs Gremlins would not increase.)