@Virgo yeh nah link backup is disable, i understand tha makes it use one as a failover.
It just seems like the whole thing is just bug ridden

@NotVeryGood 

There are some recommended settings from TPLINK. https://www.tp-link.com/us/support/faq/3147/

@John1234 ok so they are recommending turning off the bandwidth based balancing. i wonder what the point of this functionality is then? 
Im trying to use both wans as both extra capacity, performance and failover, because internet suppliers here are totally hopeless and fiber breaks happen so frequently that you cant just have one connection if you need internet. Once i even lost the backup during an 8 dya outage of the big primary one. Just hopeless.
So ill try this, but I dont want to hammer my backup ISP guy because im not like that, i dont want to inundate his connection if my 300 mbps is perfectly capable, but I pay him so much more for his 90 mbps than i do for the other 300 mbps that i want to gain somethings from it always.
It seems kinda counterintuitive to tell the router to treat them both equally. 
Does turning off this bandwidth based thing cause the router to do some kind of speedtest to work out how to balance? how does it work?

@NotVeryGood 

From the guide: 

To enable all WANs to participate in the testing process, please go to the router page – Transmission – Load Balancing, make sure “Enable Load Balancing” is checked, and “Enable Application Optimized Routing” (which will cause all speed test traffic forwarded via the same WAN port)

and “Enable Bandwidth Based Balance Routing on port(s)” (which will cause only part of the WAN ports used during the test) are unchecked.

By this config, you will use both WAN ports at the same time. Randomly forward traffics. So, you can use the 90Mbps and 300Mbps at the same time. Traffic will be randomly forwarded to two ISPs(WANs).

Somehow, you will get aggregated bandwidth when doing speedtest. That's what I heard when they release this FAQ. 

https://www.tp-link.com/us/support/faq/2079/

ok so its either: random, failover, or distributed according to my manualy entered capacity figures.
ill try the random one, (bandwidth balanced disabled) and see how many complaints I get.
Howeer, the problem has been that, when I edit the figures in the bandidth for each WAN, it jsut shits itself and fails one of the WANs and sends all traffic thorugh the other till the start align and the moon phase checks out, so im not sure how this is related, or what is going on, but im encouraged to at least learn something. Honestly i didnt have much hope that anyone out there woudl understand this router. Ive read the manuals, but nothing really made any sense.

I'd really love to understand what each of the 3 load balancing checkboxes actually mean, honestly theyre pretty confusing to me, im not a netowrk engineer, i work for the field engineering division in my role for an ISP. :/

@NotVeryGood 

Three boxes: 

"Enable Load Balance", literal meaning. Google has more explanation for this. 

“Enable Application Optimized Routing” means (which will cause all speed test traffic forwarded via the same WAN port)

“Enable Bandwidth Based Balance Routing on port(s)” means (which will cause only part of the WAN ports used during the test)

To understand load balance, you have to know about sessions. Load balance is about session balance. You access the network by creating sessions to communicate, to back and forth data. You download a file, that may create multiple sessions or only one(very few cases in real network). A session can be established and back and forth the data for 1GB or 2GB or 100MB or 10MB. That will be calculated in the WAN stats. 

You can post your entire network diagram and settings. WAN config, WAN stats. People will help check and find out if this is a mis-config. 

thanks john thats exactly the guidance i needed. I have been taught about sessions from my IT friends and i geuss i never really connected the dots in my head.