Thanks for the responses.
The Converter charger is an IntelliPower 9100 which provides a constant 13.6V charge. (don't have the Charge Wizard which does 3-stage charging)
I will switch the batteries to only use the 2 year-old EverStart 105Ah batteries, which are hooked up in parallel.
If this setup doesn't solve the low-voltage problem, I will look into upgrading to Lithium batteries, but will need to also change the Converter charger.
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