Hello I would like to help you
when you Check the Start on the bench it Should really jump and twist.
If this is the case then inspect the Electrical connection to the start.
This could be a problem with being able to supply enough current through the starter to spin the motor.
You can try with jumper cable to connect the engine block to the neg side of the battery to check for a bad ground.
Also put a volt meter on you battery when you try and start it. It should not drop below 10 volts if it does th battery may not be good or the starter motor has a internal short.
you could have a bad starter motor that just can't supply the power.
Last you need to make sure that the engine is not somehow stuck and will not turn
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