This is the exact issue in most grids TBH. Not sure I've seen one that has properly priced fixed costs with properly priced usage costs. My grid has the split, but the costs seem out of proportion. I'd say if the concern is low-income pricing, factor out fixed costs and rates so the the mean low-income prices stay the same. Mix that with only offering wholesale rates for customer backfeed and some reasonable controls about how much and when customers can backfeed.