In my opinion, while SLT is great in building up structure, habit and power, it alone is not great for being the aggressor and getting into range. Try sparring with someone who is mobile (e.g. Boxers, MT etc) and see how well you do just using standard SLT and reactive Chi Sau techniques.

Chum Kiu, on the other hand, is great for being the "aggressor", actively moving in, "seeking the bridge", intercepting, jamming, chasing and pressing the opponent.

Of course, part of dominating the opponent is through "sinking bridge" to almost lock him in and take away his mobility. Almost like a "clinch" but not really at the same time.

In a fight, it is necessary to be the "dominator", be active instead of reactive. Make the opponent deal with you, instead of you dealing with the opponent.