Any Leshiy gurus out there?!?

Again, I’m absolutely new to the airgun world. So bare with me. I’ll be throwing some kook questions out there for sure. Thanks for your patience.

Sooooo....
I love my EDGun Leshiy but it’s touchy. Shoots my H&N 18.21gr Baracuda Hunters just fine until I get down to around 200 bar. Once there it won’t send a pellet, or even if it does it won’t send a second one (so no double tap). However, once I’m down to 200 bar I can send my H&N 14.66gr pellets just fine, including double taps. Is this normal?!? 
I turned up the regulator as was suggested by EDgun West...but instead of bugging that dude I thought I’d seek wisdom and advice here.