GMST Class Testing

Can bowmaster (namely Karen) here test, if concentrate and attack pot stack? It'll be nice to test with att pot, then concentrate, then another attack pot to see if order matters. Oh, don't just look at the range alone, test some damage too. I guess it'll be hard to test if the range is client sided or server sided too but anything helps. Also, test if dragon pulse, hamstring works on boss monsters. And does PKB still knockback only if the hit exceed KB value or like it used to 100% at max level regardless of damage? Also, does the critical boost from evasion works for the first hurricane arrow only or the entire nonstop array, strafe should crit all 4 arrows after you activate it and any mob skills should guarantee crit the first targeted monster, test that too. :p