ARs - Mixed Movement + Tactics?

Using more than one movement type is a good idea, but tactic buffs are eventually going to be risky unless everyone has tons of HP because fully upgraded panic manors hit three columns and smart players will use terrain and perhaps units to funnel you into those three columns.

getting at least one cavalier ranged unit is a great idea.
They can quickly destory key buildings or get you that aether refil

i'd suggest investing in some movement aid skills like guidance, WoM, and the like, since it'll make destroying structures and avoiding their debuffs easier. I'd also suggest investing in some spur/goad/ward/whatever skills as well since they aren't effected by panic