how long has this been going on because there still seems to be issues.
regarding your power levels...
http://www.cableforum.co.uk/board/34896851-post3.html
going by the above link your down levels are ok although if you wanted you could have an attenuator fitted to lower the levels a little. your up levels are minimum going by the link above which might need looking at ?
call VM 150, raise the packet loss issue (grab a ref number if possible)-no ref- post the packet loss on VMs community forum and just wait until you get a response. book a tech to sort your power levels via the 150 call