I have the D7100 with the 55-300mm lens that came with the kit. I've been able to get good shots outdoors of football and lacrosse. My problem right now is indoor sports (basketball, wrestling, indoor lacrosse). The pictures are coming out dark and blurry at times. I purchased your cheat cards for this lens but there is nothing about sports indoors. I know lighting is always an issue. Can you recommend a starting point?