Drivetrain help please

Guys, need some help. I'm setting up my new drive train (SLX 10sp double) with SLX rear and shifters. Trying to sort the rear mech. Got the lower jockey wheel in line using limit screws but when I connect the cable and try shifting I get a problem. Basically I can shift to the lowest gear but the upper jockey wheel stops the chain moving to the upper cog. Even with the b tension screwed all the way in. So I am wondering if the chain is too long and not putting enough tension on the mech so it is in the correct place. I set the chain length as large ring - large cog + 2 links.
Any thoughts?
Any thoughts?
0
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Have you sized the chain as per manufacturers instructions/parktools/sheldon brown (all give the same length).
'upper cog' being which one?
retired 9.6kg Carrera Kraken
The Carrera Hardtail combined thread - come on all you Carrera's!
The Sons Scott Genius RC20 build
How stretched forward is the lower part of the mech when this happens (photo's would help).
Does this happen with the chain on both front rings or only one, if so the larger or the smaller?
retired 9.6kg Carrera Kraken
The Carrera Hardtail combined thread - come on all you Carrera's!
The Sons Scott Genius RC20 build
Thanks for the help