I would say your dosing is helping, just not keeping up. If everything else is good, dosing your dKh, Ca and perhaps Mg between water changes should fix things. Personally, I try to have my tank parameters maintained by my dosing rather than water changes. Your dKh dosing should be next to free once you figure out a DIY recipe, which is very easy and a great start into the DIY world (google or forum search this). This method should also be less expensive then larger, more frequent water changes, especially on the larger tank. Good luck!
Dan
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