Optimal signal levels 2.4/5 GHz for multiroom setup

RouterOS Wireless Networking
1

Hi all, I have a Capsman network with 13 CAP AC APs, 8 of which are in dry-board rooms + 5 CAP XL in warehouse halls. I have set up 2.4 GHz and 5GHz channels manually, and was careful to set 2.4 GHz channels not to overlap.

The question is how to set signal levels? - currently I have set signal levels as following:

2.4 GHz: 3dbi
5 GHz: 6dbi

Do you think this is a good approach? Lowering signal levels to facilitate easier switch over from AP to AP?

2

The output power level of the access point is determined from the zone of its coverage, at the border of the zone should be -67 dB from the power depends on the size of the zone.
http://forum.mikrotik.com/t/degraded-wifi-performance/158249/1

3

Appreciated.