I've got it. 

I'm still mining for a TimerSpy solution and trying a process of elimination to obtain a solution. I'd rather not drop Thumb1 but 4 Tetrinsics = 1/2 a Tetent. Until proven otherwise, a 5th Tetrinsic is just a bonus quest. 

One of the things noticed was that my hands go into my pockets all the way to the wrist, and that the pockets would rather have a guadual thickness increase instead of a micro wall/step. This means that the current solution would catch on the motor blocks anyway, no matter how thin the load-cell side section could be. Additionally, I'd rather not test 2 different Tetrinsic designs where 1 has the motor above and another below the active area.

Having a door-stop-like shape would solve these issues, and give me more space for a strain guage solution. It would also likely look less clunky on the backs of my hands.

For the force sensing, I've been thinking about this video and solutions that could be made from off-the-shelf components or a custom aluminium PCB {video below]. Unfortunaltely, it doesn't seem like there's actually that much information outside of strain guages that are bonded to metal, so it seems I'm still going to have to learn as I go with the printed load cell solution.

I'm thinking that Thumb1 is going to be tough to fit in the space provided on the back of my hand. I still think it'll be really nice to include it though; what I've learned from Tetent concept prints is that fingers don't really like floating in air whilst others are doing precise motions.

This Tetrinsic proposal is still Gen 3X1. I count different generations based on the PCB. If I could use the same PCB (or PCB idea), it's the same generation.

Solution mining... ends, in 27 days.