Leaf Springs

Have him keep the plans for the spacers he makes for you. If they turn out right I may be interested in a set.

will do

What exactly is your car doing that your not happy with ?
I watched your video, and there was nothing I could see wrong.
Actually there was hardly any movement at all, and it looked like you took off straight.

the shackle angle is vertical... as the pic wild posted shows is that the suspension can unload on launch... i don't like to just leave thing wrong alone... rather fix it and be done with it....

Go to local chassis builder, buy some thick tubing, drill hole in subframe, move the top of shackle mount point.
Try that, and still find out why your suspension is too stiff. If the tires hook, the chassis should rise in the rear,transfer power, and put rise on front end.

no inboard spring kit... and i would have to bolt/weld an extention onto the original box that the upper mount goes to and then weld the tubing to that...

also the suspension shouldn't be to stiff now with the SS springs under it...

What was your tire pressure again?

Street Tires 30 psi