I really don't think that claiming neutral extractors is any sort of advantage towards the Vasari, if anything it's a handicap - because taking them is critical for a Vasari, and they are incredibly easy to lose to another player. And there is nothing stopping the other races from sending out escorts with their colony ships and doing the exact same thing... hell, the other races' colony ships can and will actually destroy a Vasari scout if they engage it in combat. Which I find amusing since in the game-lore it states that the initial battles of the TEC-Vasari war were won by the Vasari scouts alone. Also, please hold no illusions about the durability of the Vasari scout and it's anti-matter regeneration - their lifespans are short and many are expended in the efforts to capture neutrals under the noses of the militia that are always present.
But this argument isn't about scouts... it's about the Skirmisher's weakness in dealing with the primary targets of the LF class of vessel. The Vasari skirmisher costs far more in Credits and Metal and Supply than the others for worse performance... and it is meant to be one of the primary attack vessels throughout the entire game. There's simply no justification for their current state!
Again, though, I think that what needs to be tweaked are the tech trees. The Vasari have techs that reduce the costs of their vessels that when you're max-labbed pretty much bring many of their ships mostly in line cost-wise with the other races (although they still are overpriced in supply - and no, the supply tech does NOT compensate, it just alleviates a little)... and I think that's part of the problem.
If the initial cost were reduced, it would be almost unfair later on after those techs. IMO, reduce the costs from the start and use those tech slots for something else (if memory serves, they both apply to more than just ships though, so perhaps just a tweak regarding ship costs is needed). And as for the Supply Cost? If kept in place I think it's fair to up the dps a tad for Skirms and Enforcers - which are under-achievers already anyway. In general, the Vasari tech trees need some serious streamlining across the board, and quite a few revisions to work out the useless.
-Itharus
Edit: Yes, I realize that just two posts ago I argued a different standpoint, and I think it remains valid, although it is likely incompatible with this post, but either or would be an acceptable nudge in the right direction, imo.