RBK50 - Slow Wifi Upload speed

Thanks for your response FURRYe38  below are the details:

What Firmware is currently loaded? 2.5.1.8
What is the Mfr and model# of the ISP modem the NG router is connected too? RicherLink Epon ONU Model RL801E
Is the Orbi system operating in Router or AP mode? Router Mode

What is the size of your home? Sq Ft? 2400 sq ft (2 floors, 1200 each)
What is the distance between the router and satellite(s)? 30 feet is recommended in between RBR and RBS to begin with depending upon building materials when wirelessly connected. https://kb.netgear.com/000036466/How-far-should-I-place-my-Orbi-satellite-from-my-Orbi-router - Currently i do not have the satellite connected. Am only using the router as of now

What channels are you using? Auto? Try setting manual channel 1, 6 or 11 on 2.4Ghz and any unused channel on 5Ghz. Auto is currently set. Tried changing to different channels, still doesnt works
Any Wifi Neighbors near by? If so, how many? Yes, 7

Try enabling Beamforming and MIMO(MIMO may or maynot be needed) and WMM. Under Advanced Tab/Advanced Settings/Wireless Settings: Tried multiple combinations disabling those, still the same result.

Try disabling the following and see:
Armor, Circle, Daisy Chain, Fast Roaming, IPv6 and Set 20/40Mhz Coexistence to 40Mhz only. Save settings and reboot the router and satellite(s). Tried multiple combinations does not resolves. When Daisy chain is disabled , the download speed also goes down.