Daz188, you can try to increase amount of PG. I tried that at 50/50 propotion, and after 3 days of steep it tastes perfect. However, i did not try the original juice.
This is the second or third time I've tried this. It's really very bland and even at that percentage the peppermint seems to. It's been a while since I've had Pluto but I remember it being more... melony? And sweeter...