Metal Maslow Sled easily tilting upward

i originally had the stock mounts from metal-maslow and had problems with tilting to the “other side”. Like described here Metal Maslow tilts at the top

After this i contacted metalmaslow and he advised to raise to 3.5 inch, which i did.

I did just hold the sled up with my hands and the sled angle is close to 100% (99.9%). Measured with my android phone. What would be the optimal angle? Same as the working area?