If I were you, I'd send those injectors to RC Engineering to have them cleaned and flowtested. They'll replace all O-rings and pintle caps too.
I had 6 injectors done for my M3, the seller took them from his running car to upgrade, and sold them to me. I sent them to RC, two of them were dripping, and had terrible flow. After cleaning, they look absolutely brand new, have all new o-rings and pintle caps, and were flow matched to 1% of each other.
Total cost was about $160. That far outweighs the cost of a burned up piston, in my opinion. (especially in a forced induction situation like yours)
http://www.rceng.com/
