I would still do weekly water changes but you could probably get away with only 10% changes. Really though, I don't think the extra 1.5 gallons a week is going to save you a fortune or be any less of a chore. A skimmer would improve your water quality either way but it is really up to you. As long as bio load isn't great your current regime should be fine. The reason I advocate weekly water changes no matter the volume is that I find personally that I start losing interest in the tank if I start slacking off on the maintenance. Weekly changes go to bi-weekly to monthly, algae starts growing and the tank looks a mess and then people get fed up and get out of the hobby. I only have a 25 gal nano and I never need to put more than 2 hours a week into it for water change, cleaning glass and lights, clean skimmer, clean HOB filter and check parameters. On small volume tanks one extra week between maintenance can make a visible difference to your rock and live stock skimmer or no skimmer. I think you are striving for perfection which is great but I wouldn't stress over it and let your livestock tell you if they are happy or not.
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