Hi Chris,
I ran a 500 for many years with good results, but it does take a little tuning to get a good start.

From your settings I would recommend that you raise the glow up to about 45 (that is less heat), which might help the plug burn out.

The start PW is possibly to high, try dropping down to about 55.

60 on the gas sound reasonable but it kind of sounds like your getting to much gas, so raising that might help (that does reduce the flow).

First thing I would try is to take the plug setting up. If you still get ignition then watch the EGT, it should come up smoothly and the fuel ramp begin after several seconds. If the EGT jumps up and the fuel ramp starts in a second or two you have too much gas, go to a higher setting. If it does not reach fuel ramp in about 5 seconds you do not have enough gas, go to a lower setting.

Once the fuel ramp starts keep watching the EGT and the RPM, they should both rise smoothly. If the EGT peaks before idle and then decreases the Start PW is to high, if the RPM hangs for several seconds during ramp the Start PW is a little low. If the EGT rises very rapidly at the beginning of ramp but does not over shoot as it approaches idle then you have too much gas.

When you get it to the point that you are tweaking the settings try bumping the plug setting to find out how far you can take it and still get a reliable ignition.

Also make sure that you are using a cold plug like a Rossi 8.

Hope this helps,
Steven