I think we can get it a bit better. A profil pic would help and you have to pin the top of the front seam closed. the sleeve pulls it away.
First I have to be sure:
Did you take the measurments for the sleeve from the altered paper pattern?
Did you take all the measurements from the pure sewing line? (one SA from the edge inwards, not measureing the crossing seam allowances?)
Did you sew in the sleeve with the sleeve seam meeting the sides seam and point K at the right point and is it in the armhole it belongs to?
Please measure the sleeve crown seam and the corresponding scye seam. They should be equal, may be the sleeve avery small amount longer.
Your back sleeve seam is a tad longer than the front one. They should match, so make the back one longer for the necessary amount.
Yes, the measurements are from the altered paper pattern (prior to shifting the yoke seam forward, as per your directions), taking care to eliminate all SAs.
I sewed the sleeve in with K at the right point as I thought that was most important, but the sleeve seam ended up being about 2cm away from the side seam, on the front side.
The body armhole, at seamline, is 51cm, and the sleeve cap is 52cm long.
With regards to the sleeve seams being unequal, how do I fix this. If I increased the length of one, line P7-P6 would be on an angle. Is this what I should do?