Fibre large speed slow

Hi

Was added to the HG635 firmware trial Dec last year. 

Download Speed dropped from about 69 to 62 after install...

in recent days/weeks I'm dropping right down to ~15-20

Speed test completted tonight on http://www.supportal-test.co.uk/

Results below...and other info on  https://community.talktalk.co.uk/t5/TalkTalk-Trials-Discussions/Huawei-HG635-Firmware-Trial-speed/m-p/1988021#U1988021

https://community.talktalk.co.uk/t5/TalkTalk-Trials-Discussions/HG635-V1-10t-Firmware-Trial/td-p/1998818/page/3

Wireless
Download 15158 KBits/s (1894.75 KBytes/s)
Upload 16603 KBits/s (2075.375 KBytes/s)
Wireless
Download 14599 KBits/s (1824.875 KBytes/s)
Upload 15849 KBits/s (1981.125 KBytes/s)

Cable direct to router
Download 18832 KBits/s (2354 KBytes/s)
Upload 15231 KBits/s (1903.875 KBytes/s)

Have switched off router for 30 mins plus with no improvement
DSL synchronization status:Up
Connection statushowtime
Upstream line rate (kbit/s):20000
Downstream line rate (kbit/s):72248
Maximum upstream rate (kbit/s):24310
Maximum downstream rate (kbit/s):72299
Upstream noise safety coefficient (dB):9.1
Downstream noise safety coefficient (dB):6.2
Upstream interleave depth:0
Downstream interleave depth:0
Line standard:VDSL
Upstream line attenuation (dB):0
Downstream line attenuation (dB):0
Upstream output power (dBm):-3
Downstream output power (dBm):-3.1