Wes - I think you're on the right track by trying more efficient speakers. May want to try a Swamp Thang as it is notably more efficient than the Texas Heat and sounds really great with Fender amps. I have an amp that I made myself, that is modeled after the Martin 112T, which was basically a lower-voltage 5E3, with trem on one channel. And that amp sounds really great with a Swamp Thang (I have a few clips of it -- the Tremster -- on my youtube channel www.youtube.com/Leonc1234/, FWIW.) Are you the only guitarist in the band? If not, is part of the problem that you can't hear yourself well above the other guitarist? If that's the problem...then I'd say there's a good chance you'll just need a bigger amp. I have another amp that is powered by a pair of cathode-biased 5881s (a little more powerful than 6V6s) that sounds a lot like a bigger 5E3. This one was made by Dan Electro under the Silvertone badge; model 1433 and with a good speaker and cab, it's just ridiculous how good it sounds (considering how cheaply it was made). It is notably louder than the 5E3 but does a lot of the same things that I love about 5E3s (easy to dial in, full, gorgeous cleans, great natural overdrive, super-responsive to pick attack and guitar vol changes) but the low-end hangs together better and has trem on one channel. I just did a clip of this amp (also on my youtube channel, FWIW).