The HB rubber cracks are hard to see because you aren't exactly able to force them to open up like you can with suspension bushings. This is one of those "while you're in there" type of things that most of us suffer from.
Agree with you on the timing chain, if it's within specs, leave it...
speaking of balancer, I'd also repalce it with a brand new unit. I know the OEM is mucho $$$ but a Dorman unit is supposedly and I confirmed this, has the same printing as the OEM one. A search will reveal all pics and info on this.
Ditto on the timing chain, slippers, and maybe the fan...