I have used various supplies and the DPS-600PB's were amongst them. All were wired by myself and none have ever exhibited issue.
Agree that there will always be some interesting phenomena occurring during buck-boost transition but none of these should result in the charger shutting down with a control error. If it were normal to throw a control error during a 30A, 6S lipoly charge when powered by ~25V supply, Junsi would be barraged with demands to fix this.
My suspicion is that there is either an issue with one or both of your supplies and it is having difficulty with regulation at the higher current needed for the 30A charge, or you have an isolated glitch with your particular 3010B that Junsi should be able to address.