2TG2SG is effective only on people wearing HighRisk armor (TGK) or Thana equipped since it reduces the hard defense (armor defense)... otherwise, you're damage will be low. Incant,2TG,SG for optimal performance. I already tried Thana/2TG/SG and was a bit disapponted since most ppl has skolls,friggs and rings... although, 1 shotting people with no skolls is awesome (you can die on 1 bowlbash too on full reflect pally with no skolls but dev card).
I suggest
str 290-300 (divisible by 10)
agi 195 atkspd + 12 agi (*so you can still spam bb even when debuffed with dec agi)
dex 450++hit / 500++ with concentration
rest are vit
I ony use 2TG2SG mostly on geared people since they usually wear gr/tgk and spiral on people wearing Fknight. Also use ROP/OLHZ for maximum damage.