eGo threaded tanks are smaller than 510 threaded ones, and usually the wick holes i the coils are smaller too. Heavy VG is thick and wicks slower than a juice with PG. One option is to dilute the VG juice with distilled water. You can safely use up to 10% distilled water. If you try this, just make a small amount, don't do the entire juice bottle. It will also dilute the flavor as well as the nic by 10%.
I agree with Racehorse, if you don't have an issue with 50/50, then it's the way to go. You're not going to blow clouds with that tank, so the best option is to go for more flavor, and PG carries flavor better than VG.