Everyone who has done this for any period of time has dealt with this. If you were switching from a 1" to a 1.5" it would help you temporarily. The solution is site injections. I very rarely inject glutes anymore, have not for years. I just have too much scar tissue. I do feel that injecting into scar tissue, in an area that is not very vascular to begin with, inhibits/delays absorption. I have not have any problems with scar tissue in more vascular tissues where I have range of motion greater than the upper glutes. Every single pro or top amateur I've ever known relies primarily on site injections.
Rex.