Best Of 3 Available Used Gas Ranges
Hi Rich, The MM you ave does have hot surface ignition, it probably uses round igniters and these use a little less than 400 watts as you found out, the KA has the flat igniters that use closer to 400 watts, the GE range could have either type.
The GE range may have a bad Electronic Range Control [ ERC ], if so I would set it out for recycling.
The KA may be viable but is probably the most troublesome of the three.
Because the MM does not have a computer control system it might become the best choice of these 3 ranges, I personally always like a true SCing oven however gas SCing ovens never work as well as electric SCing ovens because they have a very hard time getting up to the 800F + temperature required to do a good job.
Best choies still is to keep the FD Compact 30 and put solar panels on the house.
John