If I get any flooding/gurgl5 with BPMODS cotton I use Muji instead that seems to solve it in my limited experience. I save the BPMODS for RDA's now.
I'm currently using BP Mods cotton in it with no issues, didn't with muji or slivr either.
That's good, I've only got a Tauren V1.5 and a few Ares MTL RTA's. Had slow flooding with both using BPMODS pre sized cotton, no slow flooding issues using Muji pads, can only assume it does a better job at damming up the juice slots.
Also got a Mechlyfe Fallout MTL zero issues with BPMODS since day one.
I'm not criticising the cotton, just offering my experience on the same issue to help.
Silly question - does the Bishop also have an AFC ring which has been pushed too far?