If you are planting with the front or back rank, you will have to place an offset into

your gps guidance system, to seed properly. 

You may have to do a chart, and maybe plug 2, then plan the other rank to place seed

in your desired center.  It should work, without a lot of complication.  It may not be exactly

like you have been using, so improvise.  I like your idea of skip row for cover crops.

Good luck.