I just stumbled upon this while Accolade collecting in Pi Canis.
I use Eject Warp Plasma 3 on a Gorn Battleship (who is also Ejecting Warp Plasma). And it seems my Warp Plasma quadrupled the effect to which it was eating away my hull at over 500 points per tick. Furthermore, it affected Tier 1s and Tier 2s that also went through the cloud.
I tested it a few times more and seems that when you do go through another Warp Plasma of an NPC (perhaps another opponent via Pvp, need to test that), the effect doubles. I looked at the stacked Debuff Icon and at one point even spiked up to 8x, but quickly went down to 2.
So I thought I alert the community about this interesting bug.