I just moved into an old house last week and I've been getting quite high packet loss. 

I improved it considerably by moving the router to another jackpoint. Given that I had a look at the wiring in the roof and it's a bit of a mess, crap spliced in everywhere :/

I think my best option here is to install a master filter at the start of the chain. I've got a fair idea of how it needs to go in but given that I've never actually wired one in before I thought I'd check...

I have two wires coming from the street, currently these run into one of the jackpoints in the middle of the house. Am I right in thinking that I should be doing something like this - 

Splice the two main wires from the street into the Orange / WhiteOrange pair on the filter
Splice the Blue / WhiteBlue from the filter to where the main wires were originally going
Run the Green / WhiteGreen pair to the router

Cheers