My oxford hotgrips get red hot on the high setting. The control unit locked up when i first got them and they were stuck on high.
I had to pull over in the end and unplug the wiring because i could not hold the grip any longer. I had to get the unit replaced under warranty.
I only have ever needed to use mine on low.
have you tried them whist riding the bike?, they dont get that hot when the bike is just on idle.
If yes and you think they are not hot on the high setting, I would suspect that the control unit may be faulty.
As for the bars, Im not sure.. but they are only cheap jobs so I would think they would be hollow rather than solid?
"Whats in that thing??", An R1 owner said.