Should DS be nerfed

Right now DS helis have 8 attack/5 def with 11 range for 130 cost. This seems fine when compared to other offensive strats such as Sky Menace, and Relentless attack. But put DS against PD, or IF and Helis will tear Infantry to shreds with the -2 def bonus on inf (leaving pd inf with just 5 def in cities; this is equal to pre nerf blitz infantry). On top of that, DS is the only offensive strat that has the ability to carry marines, further increasing its power (Marines having 7 attack, and a +1 def bonus against infantry).

Should DS helis be nerfed, or should infantry have the -2 def bonus vs helis removed.

Thoughts or ideas?