I haven't done the mittens, yet anyway, but your best bet may be to follow the pattern as written rather than try to alter it. I think that's harder. Maybe someone has done this, and they'll chime in here soon.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry