Cudy LT 700 AND LT18

[radicaldoc]

i am running an LT18 at the moment with 2X2 Mimo antennas.. i have been using this for a few years now. but i don't feel i am getting the best i could is there anywhere specific that i need to do to make sure it is using the 2X2 MIMO right.i saw somewhere that if your router supports 4X4 you should not use 2X2 as it will be detrimental..is this true ? i have been looking at a Maswell Antena 5G Exterior 4X4 MIMO | bis zu 6 dBi Omni Mobilfunk 600–8000 MHz Cross Polarized LTE 5G NR Außenantenne mit WiFi 6E for Wohnmobil House Robust Router Modem | SMA y TS9.anyone tried one of these and would i get a lot better signal?? Although a bit rich for my pocket really.
thank you