Re: country clean tone??
I have a question: how loud are you playing your Twin?
because unless you push ANY tube amp, you will not get the best tone
Twins are great amps, but they are not for everyone, and I think they are one amp that a lot of players over the years LOVE, but a lot of others feel that it's just too much amp for their situation
the reason you are getting a mid range honk is because all the tubescreamers, and the other pedals you've mentioned, HAVE A MIDRANGE HONK!!! However, lots of people also run tubescreamers as a clean boost by turning down the drive, and increasing the level. There are other ODs that are more transparent, though, such as the Maxon OD808 & OD 820, the Klon Centaur, and the Fulltone OCD. The Fulltone FDII is a tubesceamer type pedal, but with the boost feature, you should be able to dial in a good OD tone too.
BUT, your basic problem is your amp and guitar. What kind of pickups are in your strat? Also, before giving up on the amp, I'd swap the preamp tubes, as Scott suggested, and the power tubes. You may be able to simply have the amp rebiased, since Fender is known to bias amps cold from the factory.
First of all, take a look at your power tubes and tell us what they are, and if they are the stock GT tubes that Fender uses, what color are they - red, white or blue?
Fortunately, there are several good production 6L6s out there now, like the JJs, the SEDs, and the TADs that Scott likes.
The good news for you is that tube amps are highly tweakable. Often, a fix is as simple as the preamp swap that Scott suggested. You may need to find a good amp tech in your area to help you dial it in, but you can help yourself out by trying a few simple things first.
I would also suggest that you "ask Myles" over on the
Expert Forums for some specific tube recommendations.
I've found Myles to be one the best resources at that. You can help by giving him specifics about your gear - guitar & pickups, amp & current tubes (whether stock or not, etc.).
and, keep us posted