1. Should have waited for the overload spring before reinstalling. This is why you are bottoming out.
2. If you are going to ride it without that spring, adjust the rear spring preload with the two side adjustments. Don't just crank it all the way up at once, small changes, 1/8" of an inch at a time makes a huge difference.
3. Remember where you started, so when you take the skid out to replace that spring, you know where it was before.
4. As for those plastic blocks, when you grease the fittings, squeeze some grease on the area where they slide. Since I started doing this, I haven't worn out one of those.