After looking at that post you're 100% correct as my XD9 has the short leade as well. It was interesting that my accuracy node range with the 124gn RMR was also 4.9 to 5.1 gns of BE-86. The best group so far is 5/8" at 25' with 5.0 gn.
Small 9mm cartridges build up pressure quick so thanks for the heads-up.