Resistance/spot welding parameters for high carbon and alloy steel

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I have a Lors 140AR rocker-style 40KVA welder with a Unitrol Solutions 1 control. It has a yoke for secondary amps readout.Looking to spot weld 0.048" 1090 to 0.030 6150. Need two spots in one cycle, about 3/4" apart. Spots will be about 0.1" diameter.Due to the hardinability of the materials, 2 or 3 temper cycles is necessary to achieve good strength.I'm having some trouble figuring out parameters (weld cycles and amps). I'm a toolmaker by trade, never done any significant spot welding.I keep trying to program smaller amps (like 500-1000) because the tips are getting blown away and the machine always reads 2,000-2,500 on the weld. Is it not possible to run such a large machine at such a small setting? I'm not really sure if I should even be attempting to run it at such a number. Maybe fewer cycles (right now, 10 cyc, 500-1000A)Any thoughts would be appreciated. We're willing to buy a different machine if 40KVA is too much for such a small job. This one wasn't expensive and we didn't have any experience with this type of process.