PCC Load balance with QoS

Hello good day to everyone here! May I know if someone already successfully established PCC Load Balance with Queue tree on it. I’m having a hard time doing it, sometimes the counters won’t trigger, sometimes it does trigger.

I used Forward chain on Mangle on marking packets. It counters on mangle but when it comes to Queue tree some wont trigger counters. How do I mark packets and do the proper QoS?
I’d love to know your thoughts and expertise on this matter. Thanks!

PS. I’m using RB5009

Hard to make comments without seeing the config, network diagram and a deeper understanding of the requirements, how many wans etc........ What are the requirements for users that is driving you to think one needs queuing as a solution, or even the type of load balancing chosen