Gear indexing

So I finished the new build last night and put all new cables and outers on but seem to be having issues with indexing on the rear cassette (xt mech, deore shifter & SRAM cassette).
The shifter will go up the gears (big to small rings) absolutely fine and will go from 9-8-7 & 4-3-2-1 fine too, the issue I'm having is changing between 7-6-5-4 as the change seems to take a long time to happen and no amount of adjustment with the shifter screw makes a difference.
Any thoughts on what to try next? I used the mech with an 8 speed setup recently with no issues so I don't think it's that.
The shifter will go up the gears (big to small rings) absolutely fine and will go from 9-8-7 & 4-3-2-1 fine too, the issue I'm having is changing between 7-6-5-4 as the change seems to take a long time to happen and no amount of adjustment with the shifter screw makes a difference.
Any thoughts on what to try next? I used the mech with an 8 speed setup recently with no issues so I don't think it's that.
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and check aligment.
Parktools :?:SheldonBrown
Does that look ok for routing?
I have had this a couple of times. What I have found is to remove the cable right off the mech, then come back to it fresh after an hour or so and start from scratch.
Hopefully this will do the job and I can get it sorted tonight, otherwise it could be a trip to the lbs to get the rear hanger checked
Thanks for the help