Same here, the only compliant I have read about with the bikini is objects and/or load sticking through the stays when packed tight or heavy. I know a few members have a simple fix for that with paracord or arrow shafts and that Kifura is creating something similar to prevent the poke through issues.
I haven't read anything about about the bikini heavy loads having the two stays become pressure points on your back. The lumbar pad is so thick I can't imagine feeling the stays through that or that they would creat presure points.