First off, welcome to the forum. To answer your questions to the best of my ability, the oil light is simply a mileage based oil change indicator. Your shaking off the line is caused by a slight oil buildup on the clutch, you will need an impact wrench to get the clutch off then scuff the pads with 500 grit and clean the grease off the bell. Can't exactly tell you what the power loss is, did it start right after the oil change? Could be over filled oil make sure it's on the center strand and the oil is not over the hash marks. Let us know what you find!