Hi Amy,
Congratulations on the symptomatic improvements. They speak volumes. As for the curl in the tongue, I don't ascribe diagnostic significance to that myself, but can see that you're circling around the idea of a Heart problem from a Chinese perspective.
My only concern about using QYT here is that it is a strong tonic, despite being cooling. The combination that is in place right now that is serving the dog so well has minimal tonic effect, and is instead moving the blood peripherally from the liver region to the skin and somatic regions. If you roll a tonic in there, you will increase liver blood flow again, and that may aggravate the tumor.
My sense is to keep doing what you're doing, and if you want to do something more, try an unrelated form of therapy. For example, before I knew about Chinese herbal medicine, I saw substantial improvements in liver cancer cases with just glutathione administration. It's powerful antioxidant effects on the liver and in general are in keeping with the anti-inflammatory effect of your protocol on the liver. Additionally, we're looking at using more IP 6 on cancer cases, since it is similarly benign, but is in frequent use by owners whose cancer patients have done dramatically well in our practice.
So that's probably the direction I'd go, apart from perhaps trying higher doses of what you're doing. Sorry if that doesn't satisfy from a Chinese medical perspective, but you've done so well that it's important not to upset the apple cart here.
Steve