You might try directly grounding the chassis of the transmitter, as this sometimes takes out the transmitted noise. If you want to listen to your transmitted signal, try receiving your test transmission on one of the many online SDR radios. The waterfall display and audio that comes back through the internet indicates what others will hear, and shows the purity and strength of your signal.
I think I will just try getting on the air. Hopefully it all sounds good. I almost did today but two things happened. The wx was calling for thundershowers and I didn't want to get my equipment set up. And listening to some slow code I was missing a bunch of characters and I figure I need more listening practice.
I will be operating out of my semi-tractor and all I have is a 40 meter hamtenna from MFJ to operate with unless I get to an area that has trees to throw up a wire and a place to sit down. Most truck stops do not, unfortunately.