I was using +15,-15 but changed to +17,-17 this setup feels more natural to me, this is on a swallow tail powder board so I can't ride switch.
I started my first 10 years off boarding with my rear foot a lot closer to zero but always had fare bit of pain in my rear leg, once I turned the rear foot further out it reduced my leg pain a lot.
had 15/-3 all last season and felt good with it, but change to -6 this year and its much better except i have not tried it on steeps/bumps yet since our upper mountain is not open yet. that little change did help my switch riding a bit in terms of comfort.
2015 Rossi One Mag 159
2015 Capita Charlie Slasher 161
You technically do have more control over the board with forward angles. It gives you more control over the edges. This is why Terje rocks positive angles. It's also why most Euro carvers rock positives.
yep...+21 / +15 for carving +18 +9 on pow
2015/16 -17- Kirkwood days
Arbor A-Frame 158 2009-10
Jeremy Jones Hovercraft 156, 2011/12
Subaru WRX 06 - 181K