Yeah, there R indicators everywhere.
5th and 7th lines (5x7=35, 57th letter is 3e/35)
18:15:48 stamp (R-post 18:14:55EST…53 secs off/35)
59:51 delta between tween and drop.
could be age (59) and 3 5's (15) or "2Y" (deeper content) or 2Y=225=1125=his birthday.
Month and day work in a number of ways too.
28=JR
27=JFK
18=R