I have a DLE 55 and people are surprised at how I just flip it once for every flight, I'm telling them to let it go before they even get a strong hold of it, lol! That engine will take my plane to the stratosphere if I let it. 3W is expensive and heavy, DA's are one of the best but are also expensive. I've had Zenoahs before and I agree, no oomf!
I have a Spektrum TM1000 Telemetry with temp and RPM and it is Ideal for tweaking the engine and trying props. I have listed an extra sensor that will work with the TM1000 (for what it cost me to make) in ebay and here on RCU. If you have a TM1000 Telemetry and don't have the RPM hooked up, get it, you'll thank me for it, it works perfect and it's ready and easy to install.