[pruning/hedging] How to develop thick hedges w/o ‘knuckling’

I've got some ruella and plumbago stands that I try to keep as tight bushes but am getting 'knuckles' galore, is the appropriate approach to cut-back below the knuckles or start cutting above them and let the silhouette of the plant enlarge over time? I guess I'm having trouble seeing how to possibly keep a dense bush at the same size, seems it'd always have to get bigger or be cut-back (and sparse until recovery), hoping to find if there's other methods!

submitted by /u/neovngr
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