Hot plugs do tend to burn out quicker in turbines, A3 would be a better choice but that is the beauty of the plug setting you can adjust it too suit plug used.

take the plug out and re connect the plug cap, hold it against the turbine case and do a dummy start (no gas) you will see how the plug is glowing, always start with a low setting first.
Just thinking maybe the ver10 ecu has a glow test function which will make this job easier.

It is normal for rpm to drop a little when it changes from gas to kero