Simple queue does not have desired effect

RouterOS General
1

RB450G running 5.13. Internet connection is DSL, with the RB450G establishing the link via a PPPoE interface.
My goal is to have a queue that prioritizes traffic in both directions to/from one particular LAN IP address, during business hours. My problem is that while the queue counters indicate packets flowing through the queue, the connectivity at the one priority IP address does not seem to be receiving a benefit from the prioritization. Activity from other addresses on the LAN is reducing the performance of the one prioritized address. I would appreciate any feedback. Thanks.

Here is the queue config:

[admin@MikroTik] /queue simple> print
Flags: X - disabled, I - invalid, D - dynamic 
 0    name="Queue-Traffic" target-addresses="" interface=PPPoE_Inf 
      parent=none packet-marks="" direction=both priority=8 
      queue=default/default limit-at=0/0 max-limit=0/0 burst-limit=0/0 
      burst-threshold=0/0 burst-time=0s/0s total-queue=default 
      time=8h30m-18h,mon,tue,wed,thu,fri 

 1    name="Laptop" target-addresses=192.168.1.200/32 interface=PPPoE_Inf
      parent=Queue-Traffic packet-marks="" direction=both priority=1 
      queue=default/default limit-at=0/0 max-limit=0/0 burst-limit=0/0 
      burst-threshold=0/0 burst-time=0s/0s total-queue=default 

 2    name="AllOther" target-addresses=192.168.1.0/24 interface=PPPoE_Inf
      parent=Queue-Traffic packet-marks="" direction=both priority=2 
      queue=default/default limit-at=0/0 max-limit=0/0 burst-limit=0/0 
      burst-threshold=0/0 burst-time=0s/0s total-queue=default
2

Guising you make use of masquirading. Google simple quies with masquirading. There is a wiki to address this.