@iqbalaydrus, what configuration did you try for fq_codel that produced 100Mbits? If you are not using virtual interfaces for WAN (like PPPoE), there is a way to use interface queue while having FastTrack enabled. The latter is the key in this approach as it saves a lot of CPU, giving you resources for queuing. It works really well for me to eliminate bufferbloat.
Take a look at my old post http://forum.mikrotik.com/t/using-routeros-to-qos-your-network-2020-edition/66683/252 In my very simple tests I could achieve ~900Mbps with fq_codel on a hAP ac2. I would suggest you try this approach on hEX just to see how far you get. Granted, hEX is a slower device, but if you can get decent real-world numbers with FastTrack + interface queues, it will give you an idea about routers you can use for gigabit connection. I’m pretty sure RB5009 would do nicely, although I don’t own it, so can’t say for sure.