I am having a terrible time hitting my landing spot (basically two lines of pavers two feet wide by twelve long each with any real accuracy. Maybe something bigger?
I had a hard time with precision landing when I transitioned to the -135. I was pretty damn good at getting it in the trap on my own in a -60, but the places I would look in the -135 didn't work because of various pieces of airframe in the way, plus the fact that it was way more squirely.
My solution was to find line up lines, but they may not be where you would look for the conventional butt-line/line up line. For me, I mostly just look through the chin bubble now for my spot, but obviously it's whatever works for you in your aircraft. At my base pad, I try to keep the skids in between a 12" wide spacing where letters are painted on the pad, just to not scrape up the paint too much. Finding the right crack and mark was the key.
Another thing you can do if you're trying to hit a parking spot is paint something that would be right under the chin bubble. At our program hospital pads, someone put a small red cross on each spot (and both directions) so you can hover the chin bubble over the cross and know you won't hit the fuel pumps or put a skid in the fall safety barrier (we land on top of a parking garage and there are 4 spots for us and one giant pad for the Navy or visiting aircraft).