Oh so it weren't on and off silly me.If you force it to 2300MHz then it will only show 4G+ when you transfer data. When the connection idles it will just show 4G.
Did you try 1800MHz and did a speedtest? If yes your last resort will be to try Band 1 (2100MHz) with the band tool.
This is a speed test on 1800Mhz
This is a speed test on 2100Mhz