The resistor is employed at LOWER RPM and load... not where you're experiencing the problems and it's not bypassed by the relay until around 4K at a medium or higher load, IIRC.... Besides, with higher resistance on it you'd be running lean, not rich. Do keep in mind that resistance varies depending on temperature too... but yes, that is a good deal higher than it should be.
You can bypass both relay and resistor by unplugging the large, round, yellow connector and jumpering the Blue wire with black stripe and the black wire with red stripe. Use heavy gauge wire.
The GTE and GE resistor packs should interchange just fine.
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