like i said look at instalation you say your rx aeiral is over the top of the esc this canot be good as its a lump of alu attached direct to about 25 power fets all producing electrical static you will probably find the ko servo is anolge and the savox is a digital servo which will be more prone to electrical interferance post some pics of the layout. im struggling to see why you need to run the rx areial over the esc.
stu
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