I just started a few weeks ago. The first time, I hacked up my face pretty good, but after that my shaves have gotten progressively better. My first blade, which came with my Merkur, left irritation on my neck and little stubbly. I just got my sample pack and used a Shark. I got a close shave but I've been getting bumps. Could it because of the blade change? Is there something I can do to get rid of the bumps and possibly dark spots left from when I used to use cart blades? Also, my lather doesn't seem to be as thick as I've seen in pics and videos, could that be a problem?