Hello Ivan et al -
I had to take a look back at your order to see for sure what set you had, Ivan. It's still listed on the site as the "Linear Ukulele Strings". It's going out these days in new packaging, saying "C20 Linear String Set - No Wound Strings" (a mouthful). The reason for the change is that we'll be releasing another version of the set shortly. It will be for the same tunings, but will have two wound strings. Thus the name for the new set will be "C20 Linear String set w/ Round Wound Basses".
The reason this thread caught my eye is the way you are using them. We use the name "C20" to signify that you tune it to key of C (g - c' - e' - a'), on a 20" scale. That's the size of a standard Baritone. Scale, by the way, is the aproximate distance from nut to saddle. For a 17" scale (standard Tenor), we recommend you tune up one step to key of D for best tension.
This is the first time I've heard of someone using it for C tuning @17". I guess I shouldn't be too surprised. A lot of the companies who offer these sets have a very low tension on the 4th string. The difference with our set is that since it's really designed for a higher tuning (and better overall tension) our other 3 strings have less tension than, for instance, a Worth "Low G Tenor" set.
Now our 4th is as fine a material for this application as I've ever found. Maybe you're onto something here, Ivan. I'm going to be out of pocket for a few days, but I'll have to give this a test run next week. Just the same, unless you play in a group, or really need to be tuned to C for some other reason, try tuning this set up - at least a half step, if not a full step.
Beleive it or not, in spite of the fact that so many people tune standard Tenors with a low G note, that string is borderline low for the volume of the Tenor body, and it's one reason so many people have trouble getting that note right (poor strings being the other). If you want to see a little science on it, take a look here at what one of the most famous (former) ukulele luthiers, David "Kawika" Hurd had to say. Towards the bottom of the page he starts a paragraph on Tenor tuning with "why should we be interested in D tuning" (one step up):
http://www.ukuleles.com/SetupnCare/TenorTune.html
Why don't you try tuning up - next week sometime, I'll try tuning down and we'll see how we like it!