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A 3 hour grid charge isn't helping, if your grid charger is charging at ~250-500ma. A well balanced battery might need 8-16 hours to be topped off, depending on the SoC, and a poorly balanced one might continue to receive benefits past the 24 hour mark. My recommendation is to leave it on all weekend, and then let it rest for a few hours before driving it.
A deep discharge can, in theory, further damage the cells (slightly?), but many have reported the benefits outweigh the downsides in a severely degraded battery. Try a long grid charge, twice (do it this weekend, and again next weekend) before trying a deep discharge.
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