Set up sizing to always leave a reasonable river bet behind (2/3-3/4 pot is reasonable), so that your bluffs will have fold equity and so your sizing with value hands is consistent with bluffing.

Also in a 3b pot we're generally very polarized going for 3 streets (our bluffs have to work much less often with smaller sizing), and I'm not too concerned about giving drawing hands odds to call (cause many stronger draws will raise in 3b pots anyhow, especially if we size it small).