to achive 90 mbps with 128 bit packets, you need 100,000 packets per second, that well past the packet proccessing ability of these radios. to get that kind of PPS you'll need to get into the bigger PTP radios.
I belive the EPMP line is good for 40,000 PPS ( NOT possitive here, cambium?)
at 40,000 PPS, you can expect to see 39 mbps with 128 bit frames, and 19.5 mbps with 64 bit frames.
normal TCP frame size is 1500 bytes, only need 18,000 packets persecond to reach 200 mpbs, the max spee the epmp can handle in perfect conditions.