It's always been my understanding that print developers are more active than film. As I've been using dektol at a stronger dilution (1:1 and higher) than normal which is typically 1:3, I can't see how normal strength HC-110 will be strong enough or you will have excessively long developing times and very flat negatives. I have been considering looking for more active developer that dektol but dektol is quite reasonable and it does work at strong dilutions.
In school we used dektol for developing lith film for making negtatives but it was too strong and the negatives were contrasty with little midtones. I'm guessing that the GBX chemistry that Jeffrey uses is more active than dektol as it is optimized for the x-ray dupe?