Not much comfort for you but at the advice of a UK supplier we started using a wAP ac LTE6 which got me to 40-50Mb but no more, better than the original RBLtAP-2HnD which was 15-20 Tops.
Cheers
Tim
Maybe its something to do with the LHG not supporting MIMO? does it support MIMO? Is LHG the best solution to LTE deployment?
Currently both 4G LTE and 5G support MIMO in the downlink and most cellular operations are deploying 2×2, 4×4 or 6×6 MIMO solutions which means multiple antennas are used for transmitting at the base station (4G or 5G Towers) and multiple antennas are used to receive at the mobile device (4G or 5G Routers). This means to maximise your 4G LTE or 5G router throughput you must use multiple antennas. In a 2×2 MIMO scenario for example, if you hook up only one external antenna even with the best RF conditions you will be limiting yourself to roughly half the downlink speed. This means it is extremely important to use multiple external antennas to maximise performance with 4G LTE and 5G.