Thanks for all the replies.
I'm just using ego twist 1300 mAh batteries, Aspire ET tanks and 1.8 ohm coil. This has been working great for me. The E-Liquid is V2's coffee flavor, 1.8 mgs. I want to try to come as close as I can to that.
Think I'm going to try combining Liquid Barn's Cappucino flavor with a little of their their cream flavor. Maybe a little sweetener too. From the replies, it looks like PG Nic is the way to go with about a 50/50 PG to VG ratio. Seems pretty straightforward, but if anyone has any suggestions I'd love to hear them. What seems straightforward sometimes isn't.