Port channel with 2 mikrotik routers and cisco switch in between

Hello

Could use some help with interface bonding. Currently i am testing bonding between CCR-1036 and CCR-1009.

I have bonded eth1-4 on both routers, mode 802.3ad, monitoring Mii and hash is layer 3/4. With this setup i get close to 4Gbps, all good.

But i would like to have cisco switch (2960x) between 2 routers and this is where problems start. With port channel 1 for routerA and port channel 2 for routerB i can get max 1Gbps, what settings do i need to use to get close to 4Gbps?

Layer 2 and 3 should be used in 802.3ad. You can see that in the wiki.