Checked up on AM here and it is currently healing for 187 every 1,5 sec. Giving a full heal of 3750 over 30 seconds. It is getting the 125% of delve boost when I do not believe it should be getting it. I did some research on the RA back from uthgard2 beta along with many others and many came to the conclusion that it was healing for 100-150 every 1.5 seconds after the 1.62 patch that doubled its tick frequency. The information was inconclusive but general consensus by doing pixel math and estimations from old videos it landed somewhere in that 100-150 per tick range. It seems as though you decided to set AM at 150/tick here but it is still getting boost from the 75-125% variance code because it is always ticking for 125%. The rejuv spec of the bard has no effect and is 125% of delve for 1 rejuv or 50 rejuv currently here.
Proposed solution: set AM at a static 150 heal per 1.5s tick for a total heal of 3k health over 30 seconds.
I know these are uthgard sites, the information researched is still valid for this patch level, and many sources are listed in their issue tracker/forum:
https://www2.uthgard.net/tracker/issue/2447/@/HIB_RA-_Ameliorating_Melodies_
https://www.uthgard.net/forum/viewtopic.php?f=128&t=38893
Proposed solution: set AM at a static 150 heal per 1.5s tick for a total heal of 3k health over 30 seconds.
I know these are uthgard sites, the information researched is still valid for this patch level, and many sources are listed in their issue tracker/forum:
https://www2.uthgard.net/tracker/issue/2447/@/HIB_RA-_Ameliorating_Melodies_
https://www.uthgard.net/forum/viewtopic.php?f=128&t=38893