Article 3 issue

I bought an article 3 awhile ago was working fine shooting lasers but decided I wanted a shorter inner barrel.

Bought the wolverine 185mm inner barrel and a maple leaf macron 70. Im still using the original hop unit and nub.

Im currently getting 0.5J on 90psi and about 220fps which shows theres definitely something up with it.

Ive tried a different engine to make sure its not that and its not still doing the same. I believe the barrel is all setup correctly but im not which part could be the issue.

Any ideas?