Overloading a merc over that 100% load, increases the odds that strength and health will rise.
There was punching cows.

(and you could,
load him up.
Tell him to travel - anywhere on the map
Do not accelerate time
rather cancel the travelplans
somehow the travel-experience is added
repeat
(perfect for Shank/Dynamo)

I've never had a Clay ... oinkoink.
City of Grumm is a block of four + 1 east of the lower-right.
Clay is in the upper-east.

You could get into the sector without claiming the mine/town.
By moving to the westside of the sector you can move to the sector above it, from there you can go south. (need wirecutters/nade and perhaps some set amount of game-progress %)

*
<-* \/
X X X X
X X X X X X

Hope these crosses make sense about that two-step approach.

The main drawback is his low WIS, and the fact that he has the pscyho trait, I want my mercs to do what I tell them not waste AP.