I haven't seen it mentioned yet and don't want to take for granted that this is known by the OP. With thread, the higher the number the finer the thread. So 100wt thread is very fine, like a human hair. The lower the number the heavier the thread.
Another consideration is ply. Obviously a 3 ply thread will have a heavier appearance than a 2 ply thread. 3 ply is also stronger.
One of the reasons so many of us love Aurifil 50wt for piecing is because it is a two ply cotton and takes up very little room in the seam allowance better allowing us to perfect our piecing skills. Like a few other posters have mentioned, you may wish to try a lighter weight thread for your piecing. 35 wt is pretty heavy for piecing, even if it is a two ply.
If you want a very heavy thread for the quilting look into a 12 wt often used for Sashiko work. However, you don't indicate if you plan on hand quilting or machine quilting. You may be limited on how thick a thread you can run on your machine. Another thing that will help your quilting to pop is a bright contrasting color.