I've not spoken to my converters about the creaks, as the creaks aren't that bad and some are expected (as you've mentioned). My converters were awesome, and have always given an excellent servicePretty sure that all pop top roofs creak; canvas, roof seal, bed board or bed board hinge. Eventually you’ll find away to resolve it, just a pity the converters can’t be arsed.
Just pretend your on an old sailing ship listening to the rigging.