Hello!

I have hAC ap router and cAP ac(arm) repeater in my house. Before that i had crappy wifi on second floor so bought this device. Now router is on 1st floor and cAP is on second and on the opposite corner of house.

Currently there is almost default settings in CAPsMAN. But sometimes the wifi isn't quite realiable as i would like to have.

So where could I improve?
When I had just router I tried one of the posts, where suggests to don't use overcrowded channels, limiting to bandwidth to 20Mhz or 40Mhz and etc, will link it here(viewtopic.php?f=13&t=130017#p638786). But what would be best home setup in capsman for those two devices, to have best signal strength and not loose much of a speed?

My current config

# jan/21/2019 16:59:22 by RouterOS 6.43.8
# software id = HI27-AU6J
#
# model = RouterBOARD 962UiGS-5HacT2HnT
# serial number = 673705E219E9
/caps-man configuration
add datapath.bridge=bridge datapath.client-to-client-forwarding=yes name=NewHopeNet security.authentication-types=wpa2-psk \
security.encryption=aes-ccm security.group-encryption=aes-ccm ssid=NEWHOPE
/caps-man interface
add configuration=NewHopeNet disabled=no l2mtu=1600 mac-address=CC:2D:E0:AF:E2:8D master-interface=none name=cap1 radio-mac=\
CC:2D:E0:AF:E2:8D radio-name=CC2DE0AFE28D
add configuration=NewHopeNet disabled=no l2mtu=1600 mac-address=CC:2D:E0:AF:E2:8E master-interface=none name=cap2 radio-mac=\
CC:2D:E0:AF:E2:8E radio-name=CC2DE0AFE28E
add configuration=NewHopeNet disabled=no l2mtu=1600 mac-address=E4:8D:8C:6B:EE:C9 master-interface=none name=cap3 radio-mac=\
E4:8D:8C:6B:EE:C9 radio-name=E48D8C6BEEC9
add configuration=NewHopeNet disabled=no l2mtu=1600 mac-address=E4:8D:8C:6B:EE:C8 master-interface=none name=cap4 radio-mac=\
E4:8D:8C:6B:EE:C8 radio-name=E48D8C6BEEC8
/caps-man manager
set enabled=yes

Do you mean, wifi from main router connects wirelessly to the capac which in turn transmits to local devices?
I wouldn't expect great results from that scenario (or recommend it) unless the capac can receive on one chain and transmit on the other chain (assuming the cap ac is a two chain device??)
(talk to hapac on 2.4ghz and transmit to local device smart phone on 5AC for example). Not sure how one would improve the performance though??

cAP ac have wired connection to router.

As it turns out that I had left the default settings for frequencies, bandwidth and etc, even in uncrowded areas it's not the best approach.

So to improve I did this.
I configured channels for 2.4Ghz and 5Ghz frequencies. Biggest improvement was for 2ghz as there was less interference now. Also channel-width should be only 20mhz, for 5g could use 40mhz if your alone with wifi in area, but anyway some posts suggests to stay that way. And do not support all standarts, for 2ghz - is enough b/g(if you don't have some old tech) and for 5ghz onlyac is best option. Of course thats not max speed, but at least I got very stable connection and speed.
This setting helps with clients switching from router to repeater when one signals is better. Sometimes you need to play with that -80 border, but for me it is perfect.