because your joints would break off in an explosion from too high force unless dms are off would be my guess.
The denser you are the harder it becomes to move. in tale slowing you down
You can increase the strength slightly, not a lot because of EXPLOSION
velocity also makes EXPLOSION

Density makes the Tori weigh more. it pulls you downforce harder. 1.25 is a lot of weight and if you add gravity on top of that its gonna be hella difficult to move at all. its rigid because you had too much density. take some more away

I've been testing the theories in my own personal mod. increasing the density of just one part of the tori can drastically change how you move.

Add some density to the torso or groin would be better, the feet for solid grounding and probably slight increases on the arms. the legs should be ok, but if not increase their value until it feels right to you.

we need more players like you to make threads with tutorials.
-----
Have you tried the bounce setting? you can move more easily, smoother and faster with it.
-----

Do you have the mod link because your replay is broken for me. I'd like to see what you are working with.
-----
if the objects are being held like gloves or something yes, you want as much freedom as you can get. friction on the object floor (if there is one} also helps.
-----
if bounce is 0 change it to 1 and look at the difference.