Have a look at @jeff's most excellent comparative testing post:
https://forum.openwrt.org/t/comparative-throughput-testing-including-nat-sqm-wireguard-and-openvpn/44724.
IPQ40xx comes out at 210 Mbps (that is the sum of up and down) with SQM under the demanding RRUL test instead of the 550 the OP ideally would require, so at least with sqm both EA6350 and 8500 might too puny to fully saturate the link, but they should punch leagues above the OP's trusty old TL-WR1043ND...
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