While he and Ye Ling had similar views and ideology on progress, Hua Ziyan and Shen Min's talent or natural perception toward in-person combat was a lot higher than Feng Yi's with the reverse in tactical group combat and troop command being true as well.
So Wu Long did not need to push them as hard as Ye Ling pushed Feng Yi for the same amount of progress. Even though he did train with them until they were completely exhausted, but not past that point.
Though he found it a little interesting Ye Ling was equally or rather even more demanding with Wu Mengqi who could be considered a sword prodigy. But he also could understand her feeling since she saw something in her that she once saw in him on that snowy day when they met, that raw potential rivaling her own that she was drawn to and became excited to uncover and polish.