Shoulder Ram, DJK = 70 pt, Shoulder Ram, PG, DJK = 68 pt?

Everything I read says Shoulder Ram, PG, DJK does more damage than Shoulder Ram, DJK. Why when I do it, it does 2 pt less damage?

Any way to get higher damage with this combo?

Thanks.

edit: I tried on Kage and Aoi.