It seems like you are dealing with lots of variables and inconsistencies. Troubleshooting these situations can drive you crazy.
Whenever I get into a mess like this I step back and organize myself and my test plan. You have at least 3 variables you need to reconcile. Which resistor produces what results, which coil should you be using, and is the wiring and ignition switch working correctly?
As a starting point I would connect a jumper wire directly from the starter terminal/battery to the coil after disconnecting the wire from the resistor. Determine if the engine starts and runs as you expect. Change only one variable at time as you troubleshoot.
Remember that the major reason for the resistor is to reduce the voltage across the points when the engine is running. The lower voltage reduces the heating and arcing of the points so they last longer.
The idea behind a "resistor bypass circuit" for starting is to simply give a slightly hotter spark to get things going. In my experience if everything is in good condition that circuit is not essential.
I will not even start the discussion about whether a coil is a 6 volt or 12 volt and if one will operate properly on the opposite voltage.
