I couldn’t find anything in the game that needed me to make use of Overguard’s extra tankiness 
But yeah, it can certainly be taken for an even more tanky setup :3
Tested setup with Overguard (transmuted because CD is too long otherwise for my liking) -
was around 3:30 min kill, but tankiness didn’t feel like it increased by much. I assume it was because I am not focusing on shield blocking and the flat damage absorption from the overguard is less effective with Sunder in play on 1.2 
.
Also tested it on Crate, but you can’t tank that one anyway + we don’t really need to rely on overguard’s extra defenses if we are going to kite instead.
.
Will run a few more tests with overguard just in case :3
Added my Soldier leveling part from this to the OP as well - IceCream - Budget Forcewave Soldier