I am training for the Pyramid Cup Gunslyger competition. Therefore, I need to quickly acquire my target. However, when I put my cheek to the stock, I see either black or fuzzy for a long time before I can find the image. Worse, when I require a full view image, it quickly goes smaller towards the center, and black creeps in. So I spend a lot of time moving my head to find it again. Are there any suggestions besides practicing to get a consistent cheek hold and keep it? Would a rubber bellows eye piece help?