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Reserve time is a horrible calculation of actual capacity. If you USED that reserve time with your starting battery you'd kill it very quickly (as you've found out). The deep cycle is not going to be damaged by your deeper cycling due to P&G. Just top it off every night with the plug in charger and you'll be fine.
The only other way to get more capacity in the same area is go with a lithium setup. Or, you can add another additional lead battery in parallel which is going to take up room elsewhere as you've mentioned.
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