My guess on your OG would be way beyond 1.096. With that much honey, a lb of jaggery and 5 quarts of additional liquid, 3 quarts of which (the plum juice) would have probably been around 1.050, I’d say your OG could have been as high as 1.180+, and certainly well above 1.150. It may be really sweet, but you may be completely done at this point. I’m not sure how well RC-212 can get going at that high a gravity, but it sounds like you asked it to do some especially heavy lifting. If you started >1.170 and it got the must down to 1.060, you may have really lucked out.