This isn't a bug. Remember, the cost of Psylocke's red varies depending on how many red strike tiles are on the board. After you removed a couple with Chemical Reaction, the cost of red went up.
Daken really shouldn't be using health packs. Just like when OBW had true healing all you need is a couple of minutes in low level pve and you heal right back up.
I can't remember the last time Daken died in PvP that wasn't either a one hit kill or taking multiple strong moves in a short period of time (like 3 turns). Maybe in PvE that very slight extra regen matters against enemies higher than level 200 or against goons that put CDs on blue (which either forces you to match it or it eliminates the blue tiles anyway even if you don't match it), but for PvP the difference between 4/5 black is negligible for grinding.