Going into flower tomorrow heres my current setup with all 6500k Im short on 2300k bulbs so for side light im going to use some of the 6500k, how much is too much 6500k during flowering?
It will be fine. You could supplement as much as you need. The more warm light for flowering the better, but you can supplement with cool light.
The most important thing to remember is the photoperiod. I flower with 6500k lights no problem. Just make sure you have no light leaks when you flip to 12/12