Before you do anything remove that spacer and put the standard rising rate parts back on..
. Dropping the rear down will amplify the issue 10 fold !
Or is it 100 fold ??? LOL
I did say earlier (between the pi$$ taking) that you should go back to square 1 and start over again ....
One step at a time ...
Even with very short legs the bird is manageable !!
I wouldn't mind losing a few inches in the knee area ...
As 6' 4" is a bit too tall sometimes !!!