tough choice, Ive not acutally played against the Drakh but personally Id be tempted to go with a bunch of Ashinata's as at low PLs your gonna be facing probably 5 raiders of some kind.
Lots of fusion beams with twin linky goodness = many many hits and if he gets close he loses his dodge too.
That said, the Teshlans beams could prove decisive against the low hulled drakh. And the extra Nials are useful too.
What are you planning to take for your other skirmish point incidentally? A torotha or two more Nial flights?