The regular script of the brush can affect the hard pen, because the brush pays special attention to strokes.
The running script is smooth and elegant, and looks beautiful. Regular script is neat and elegant, but serious write slowly is not good-looking. Yan Ti Liu Ti said that both Yan Zhenqing and Liu Gongquan had their own font styles. Personally, I think running script is beautiful, universally recognized and fast. This is regardless of novices. This is what you want to write and what you want to practice is calligraphy. If you can persevere, you should start practicing regular script with a brush. If you want to write well, practice writing hard. Soon, you can see the effect soon. Writing good words and calligraphy are actually two concepts.
Your poor spacing is your poor composition, so you need to practice more. When writing, you should look at the overall situation, not just the reasonable allocation of space in one place. You can change it.