Not sure what you are asking. Are you wondering if it will work or are you saying that you have a problem using this combination.
I use the Spektrum, with an M11 and an Airtronics digital servo with a LRP Q2 with no problems. But then again, I use the large cap onall my ESC's.
Try it for yourself. If it doesn't work or if you have problems, install the large cap that came with the ESC and that should solve your problems.