wireless go through bridge decreased

Hi!
I have link with 921UAGS-5SHPacD routerboard and dish in 20Km range
when i run bandwith test between link its ok and give me 80meg receive but when i run test from RB3011 (or 751) from lan to other wireless give me about 60meg and test in lan cable 170meg!!!
I turn on ethernet flow but nothing
this is my config

/interface bridge
add auto-mac=no name=bridge-local protocol-mode=\
    none
/interface wireless
set 0 band=5ghz-a/n/ac \
    channel-width=20/40mhz-Ce default-authentication=no default-forwarding=no \
    disabled=no frequency=5290 frequency-mode=superchannel guard-interval=\
    long l2mtu=1600 mode=ap-bridge nv2-cell-radius=19 rx-chains=0,1 \
    scan-list=5000 ssid=2 tdma-period-size=3 tx-chains=0,1 \
    vht-supported-mcs=mcs0-7 wds-default-bridge=bridge-local wds-mode=dynamic \
    wireless-protocol=nv2-nstreme

/interface wireless nstreme
set wlan1 framer-policy=best-fit
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik

/interface bridge port
add bridge=bridge-local interface=ether1
add bridge=bridge-local disabled=yes interface=wlan1

Its not the bridge which create problem. The CPU is running out when u test it from wireless device. Not to worry. Disable flow control

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Also ur nv2 cell radius is 19 km but ur link is 20 km. So set it to 21 km for best result

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