This is exactly what Spey, Scandi and Skagit lines are designed for, turning over big bulky flies at distance. With a single hander try a WF line one size heavier than your Rod rating and add a Poly leader or even a very short (2ft) piece of T12 on the end of the fly line. This will add mass to the tip and help to turn over your leader. With a Spey or Switch rod you can add up to 12ft of T12 and still cast well but a single handed rod will not be able to pick up this much so have a bit of a play and see how much your rod will handle.
All the best.
Mike.