Close to here a former H-6 pilot is flying his helicopter R/C models as an expert - upsid down etc.. So, yes some helicopter pilots do fly model helos. I've bought the same "Chinook" as you from a "farmers store"! (I Put the one with obviously "screwed" blades to the back.) The problem is trimming. You certainly did a good job.
Good question?:
Do you need to be a "normal pilot" before beeing a "helicopter pilot"?
Happy New Year!
PJC, ATCO, Helicopter Wing Karup, Denmark.