Thanks for all the great suggestions!
I wanted to update everyone on my project. For this revision, I'm going to leave it with just a USB micro input. I waffled on the power input for a long time. In my case, I usually have a USB micro cable around vs other cables and I wanted to use this board as a learning experience for trying to place some parts I haven't used before.
I did modify the voltage reading to be after the coil as Jay_Diddy_B and _Wim_ mentioned. Good catch!
I'm a little embarased that I missed that.
The large resistors are WSC4527's from Vishay. I ended up with those by reviewing the Agilent U1880A fixture. The were pretty easy to source for me.
If I do another revision, I'll likely change it to the 1206 resistors in parallel and add an alternate power input as that does make sense. I also like the idea of a pulse input!
_Wim_, what FET did you use to get such fast rise times?
_Wim_ and Ribster, would you be able to post schematics of your projects?