Hello,
I have Mikrotik HAP AC3 and some problems with wifi. 2.4Ghz network works pretty fine, but 5Ghz is not that good as it could be. I was trying many configuration combinations and depends on settings speedtest shows 50-150 Mbps download and... 70-230 upload. Mostly upload is twice download speed. Also signal is not well, computer is about 5-7 meter far without any walls on way and it is about 55%. Comparing all of it to isp device it is very poor because on simple zte router bandwidth reaches up to 370-400 download and 400-430 upload. Signal is similar situation, the same position for endpoint and router, it shows about 80-90% with isp device.
Can you point where problem may be? Can it be some configuration issue, or maybe hap ac3 is not good at wireless?
https://i.postimg.cc/mbNmbWjd/mkt.jpg