Up until the last two ranks of Braxi's Howl, it would not overwrite T`vyls Resolve. In Laurion's Song, Braxi increased to 20%, and T`vyl's remained 20%. While they both are 60s duration, Braxi has only 110 counters before it fades (essentially seconds/milliseconds in raid/group content). Having a debuff overwrite and then fade immediately is terrible. I would suggest to reduce Braxi back down to 19%, or find a different SPA that can coexist with T`vyls.