First you are adding a lot of fish and performing this over 2 days could cause a mini-cycle. Also, your tank cycled rather fast, even for a fishless cycle and based off that alone I would still be concerned about a mini-cycle.
Besides, performing the normal routines of things like moving the old filter and some decorations over for a week or two doesn't hurt anything and could actually help your tank in the long run.
Besides, performing the normal routines of things like moving the old filter and some decorations over for a week or two doesn't hurt anything and could actually help your tank in the long run.