VPN server (pptp) & Ethernet bonding (LACP)

ROS 5.24 x86 with runnign PPTP vpn server on it.

Two bonding interfaces:

/interface bonding
add arp=enabled arp-interval=100ms arp-ip-targets="" disabled=no down-delay=0ms lacp-rate=30secs link-monitoring=mii-type1 \
    mii-interval=100ms mode=802.3ad mtu=1500 name=bonding1 primary=none slaves=ether1,ether2 transmit-hash-policy=layer-2-and-3 \
    up-delay=0ms
add arp=enabled arp-interval=100ms arp-ip-targets="" disabled=no down-delay=0ms lacp-rate=30secs link-monitoring=mii-type1 \
    mii-interval=100ms mode=802.3ad mtu=1500 name=bonding2 primary=none slaves=ether3,ether4 transmit-hash-policy=layer-2-and-3 \
    up-delay=0ms

bonding1 - to vpn-users
bonding2 - to Internet

Traffic on bonding2 balanced very well

> interface monitor-traffic bonding2,ether3,ether4 
                     name:   bonding2    ether3    ether4
    rx-packets-per-second:     51 169    24 133    27 036
      rx-drops-per-second:          0         0         0
     rx-errors-per-second:          0         0         0
       rx-bits-per-second:  448.3Mbps 209.2Mbps 239.1Mbps
    tx-packets-per-second:     40 881    20 085    20 796
      tx-drops-per-second:          0         0         0
     tx-errors-per-second:          0         0         0
       tx-bits-per-second:  128.3Mbps  67.0Mbps  61.3Mbps

But, outgoing traffic on bonding1 (to vpn-users) is not balanced at all

> interface monitor-traffic bonding1,ether1,ether2
                     name:   bonding1   ether1    ether2
    rx-packets-per-second:     52 633   23 529    29 104
      rx-drops-per-second:          0        0         0
     rx-errors-per-second:          0        0         0
       rx-bits-per-second:  119.1Mbps 55.3Mbps  63.7Mbps
    tx-packets-per-second:     65 103       15    65 088
      tx-drops-per-second:          0        0         0
     tx-errors-per-second:          0        0         0
       tx-bits-per-second:  503.3Mbps 22.3kbps 503.3Mbps

In docs says that “layer-3-and-4” transmit-hash-policy is not fully 802.3ad compliant.
Is there any solution to utilize more than one Ethernet port for VPN-server?