Ive got loads still
modules and rxs I still lean towards the rest of the guys though . I have 3 ko helios wheel radios with spekky modules and about 20 rxs I rarely run capacitors and have very little issue I do remember ko suffering a bit from worn pots (not an issue on wheel radios)
Other option is to ask a fellow user to bench test your module and rx to see if problems transfer to his car ( I suggest putting car on a stand initially)
Regards dave