Tp-link wr1043nd v2 and v3 poor wifi performance

Hello, I have 2 wr1043nd v3 ~~~ wr1043nd v2 doing wds bridge, both are 720MHz CPU, 64MB ram, in dumb AP mode, running OpenWrt 18.06.1, r7258-5eb055306f, v3 and v2 are quite the same hw, but download is only 50mbit/s, upload 80mbit/s on cable. I'd take 80mbits, but not 50, that's too bad. I remeber barrier breaker wds bridges running at least 90mbits in both ways on older hardware. What could that be?

client:

root@wr1043ndv2:~# iwinfo
wlan0     ESSID: "v3"
          Access Point: C0:4A:00:40:xx:xx
          Mode: Client  Channel: 13 (2.472 GHz)
          Tx-Power: 15 dBm  Link Quality: 70/70
          Signal: -29 dBm  Noise: -94 dBm
          Bit Rate: 270.0 MBit/s
          Encryption: WPA2 PSK (CCMP)
          Type: nl80211  HW Mode(s): 802.11bgn
          Hardware: unknown [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0

ap:

root@wr1043v3:~# iwinfo
wlan0     ESSID: "v3"
          Access Point: F4:F2:6D:22:xx:xx
          Mode: Master  Channel: 13 (2.472 GHz)
          Tx-Power: 15 dBm  Link Quality: 70/70
          Signal: -31 dBm  Noise: -93 dBm
          Bit Rate: 324.0 MBit/s
          Encryption: WPA2 PSK (CCMP)
          Type: nl80211  HW Mode(s): 802.11bgn
          Hardware: unknown [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0

wlan0.sta1 ESSID: unknown
          Access Point: F4:F2:6D:22:xx:xx
          Mode: Master (VLAN)  Channel: 13 (2.472 GHz)
          Tx-Power: 15 dBm  Link Quality: 70/70
          Signal: -31 dBm  Noise: -93 dBm
          Bit Rate: 324.0 MBit/s
          Encryption: unknown
          Type: nl80211  HW Mode(s): 802.11bgn
          Hardware: unknown [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0

I have option noscan 1, and HT40 bandwidth on both. Channel change does not make any difference, routers are in the same room. Please help.