Wondering what to do

So I am relatively new to carto tanks and I'm dealing with an issue. All I'm getting is problems when using 100% VG in my UDCT. The juice I'm using is Vanilla Custard from VCV, and I'm worried to use my others for fear of wasting juice. I know that since VG is so damn thick it's hard to get the juice into the carto through the punches. I get the carto's at my local B&M and I believe they're Smok as well, two-punched. So my question is is there a better carto or anything I could do to solve this problem. I've heard of diluting with PG or water, but I'm concerned with muting the flavor and nic strength. I really don't want to have to use Nova's for these!