SL doesn't have set schedules, but as soon as an appraiser tries to raise fees y'all cut them off until one of you gives. I know because when I did work for SL, that's exactly what happened. I'd get a better client, raise fees on SL who would cut off work for awhile and then come back promising more volume for lower fees.
It's disingenuous for SL to act like appraisal quality matters when the reality is your just trying to maximize profits, by hiring the cheapest appraiser possible, quality be damned. It's a balance for fee vs quality and I get that SL is a for profit company, so are appraisers. But the charade is BS. And SL is in your control. You can influence the decision to hire firms instead of just individuals. You can influence the decision for SL to move to a cost plus model. You can influence the decision to hire quality appraisers and pay them market rate. You pay between $250-$300 in Atlanta. Market rate is $450. VA is at $440. Catch up on fees and your service issues will start to fade.
PS. Say Hi to Alan for me.