PCQ Queue Pariority

Dear all
I have several network with the following ip ranges

192.168.12.0/24
192.168.128.0/24
192.168.26.0/24
192.168.56.0/24

each range have PCQ rule that shape per users upload/download .
and also each range have NAT rule to specific valid ip address

192.168.12.0/24 → 2.17.18.x
192.168.128.0/24 → 2.17.18.y
192.168.26.0/24 → 2.17.18.z
192.168.56.0/24 → 2.17.18.w

i want to bring up cache server with ip address of 2.17.18.N
how can i configure my mikrotik, to do not shape my user’s traffic to cache server?

i try to set up a queue rule with dst ip address of my squid and change its priority to higher than others but no success.

any idea will be appreciate

any idea?