Since the only variant between the two set ups is the fet job then process of elimination should take you there first. How was the board performance prior to fetting? Sometimes the additional current flow capabilities can give the car what I call Red Bull disease. Jitters. The range issue mentioned in the original post could be caused by a less than ideal antenae lead connection to the board itself and is commonly overlooked while trouble shooting. Make sure there are no stray strands of wire getting friendly with something they shouldn't.
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