Most of the others are on track. Manufactures serial numbers(second line) numbers most likely refer to model, dates of manufacture,wood used, who made it or what line it was on,tracking numbers, those kinds of things
The other number is lenght of bow and draw weight poundage at 28 inches.
the 35+ probably has a draw of more than 35lbs and less than 40lbs
same with the 45+ draw is likely between 45lbs and 50lbs
with only one + it most likely closer to the lower end of range if either had a ++ its closer to the high end
the -35- bow was probably spot on when orginally made with a 35lb draw