yes indeed... those strings would be WAY too light for that scale length.
I have two OM's with scale length of 20.5"... I generall use strings at 14-24-34-44 ... or 16-26-36-46....or some combo thereof. You may need to spend some time trying different combos and fine-tuning the tensions for your instrument. But don't expect to find the right combo in a pre-made set. Those are generally designed for 22.5 or 23 or so. And yes, probably a wound A set will be part of the mix.
If your tailpiece takes ball end strings (or you don't mind breaking the balls out of the string ends), you can probably get singles at any big music store like Guitar Center. Or you can order loop end strings individually and put together custom sets from some of the online outfits like JustStrings or Big City Strings.
My suggestion would be start with a set of 14-24-34-44... and then tweak accordingly... see how they sound and feel and if one course is just not giving you what you want, go up a gauge. If one course feels or sounds to powerful in the balance, then go down.
Good luck and let us know how it works out.
Karen Escovitz
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Otter OM #1
Brian Dean OM #32
Old Wave Mandola #372
Phoenix Neoclassical #256
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If you're gonna walk on thin ice, you might as well dance!
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