Many 120 volt kilns are underpowered, and yours is only a cone 6 kiln so it's even more underpowered than a cone 10 version. At a cone 6 rating it really shouldn't be fired higher than cone 3. They need everything working properly in order for them to function correctly. At 8.8 ohms your elements are 10% off from the factory original, which is exactly the amount of wear when replacement is recommended. Assuming everything else it working properly (thermocouple, relays, etc) then it's probably the elements causing the problem.
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