that time of the evening immigrations can be a bit of a wait for non us citizens, especially this time of year, gets better as you get later into the fall, Bos is pretty efficient but be prepared for long winding lines,

I would also suggest you consider walking between terminals, it is usually quicker, I say usually because if you get lucky and the bus is right there the bus might be quicker, you can reclear security in terminal e and walk airside or walk landside and go thru security in b, I mention this as you said hbo only, I always walk I know I can be there in about ten minutes whereas the bus is an unknown, there is a fly Logan app and website that have decent info,

All that said you should have more than ample time