Standard ironing boards, and even boards designed for quilters, often have a fair amount of padding. The give in the padding can interfere with what you’re trying to achieve.
For the crispest, flattest blocks try using a very lightly padded pressing board. You’re likely to see immediate improvements in your pressing.
Cristy, from Sew Much Like Mom, provides instructions for making your own pressing board. While it’s not difficult to make, you’ll need some tools. You may also need help cutting the supporting board to your preferred size (Lowe’s and Home Depot can probably do that for you).
Sand the edges of the board, cover it with a layer of batting and canvas, cover the back and you’re done.
Just be sure to read all the way through the article before you begin.
You’ll love having this board in your sewing room. It makes a wonderful gift for quilting friends, too.