i have noticed a massive drop in dps

i am i lvl 887 and i use a decent macro from the marksman portfolio (ron aoe) and have for about 2 months, however since 7.2 there appears to be a nerf i did not notice, can anyone assist me in pin pointing the nerf and are there any new button mashing macros to make marksman competative against equalully geared frost mages on a lvl 110 dummy in trusshot lodge using volley i hit around 960 k over 6 mins artifact knowledge 38 with legendary boots and waist