At your power I expect your using a speed density tune so the checkvalve is not needed with SD. Take a plyers and twist and pull it out and let it breathe.
Now, center of can has no valve inline and should connect to the rear of the drivers side valve cover with the fixed orfice drilled out. (we have these on 1200 RWHP builds with zero issues, so we have to figure out what is going on in the system).
One outer connection from can WITH checkvalve flowing away from the can (we had an employee here for 3 months that sent out a hand full with the valve in backwards...make sure it flows away from the can) to the vacuum port on the passenger side of the intake manifold snout.
Second outer fitting with check valve flowing AWAY from the can to the inlet of the head unit as close to the turbine as possible w/out making contact.
At idle, pull line off from rear of drivers side valve cover and make sure you have good strong vacuum at the hose end. If so, slide back on.
Also, are you using stock valve covers? Most after market ones have NO baffel under them and the rocker arms will throw oil right out the outlet fitting and suck in filling the can. Make sure you have a good baffel in the valve cover to prevent this.
We had 2 others with the same issue in the past week. One had the check valve line on the center so it could not evac and built up pressure and had same symptom. Other had the valve flow the wrong direction with the same results.
