Probably soft-capped smashing/lethal, and either soft-capped or very high FCEN. Good resists, good hit points, reasonable regeneration. If you can pull it off at the same time, good recharge for the top DPS chain (+225% in Storm Kick), but that might be a bit of a stretch. Probably go with some alternate chain.
"That's because Werner can't do maths." - BunnyAnomaly
"Four hours in, and I was no longer making mistakes, no longer detoggling. I was a machine." - Werner
Videos of Other Stupid Scrapper Tricks
I know that MA/WP is not the first choice that comes to mind for soloing AVs.
If you were to make a MA/WP geared towards fighting AVs what would the build look like?