Welcome to the forum Greenbaysplash
Well that has to win post of the week, a very clear concise report. First of all well done for sticking with it and congratulations on your result and the report about the squish, please could you post some pics to let us have a look
Just make sure you do not use a spray containing metal oxide such as lead or zinc as it will attenuate the signal.
Just as a matter of interest how are you feeding two stb with the sqish?