After years and years of "playing around" and a lot of frustration, our own Captchee and myself had this same little talk over and over again more than ten years ago on a different forum.
Over time I have found that a simple over-powder-wad, followed by your favorite lube on a thin patched ball has worked best in all my smooth bores, and I own three of them in different calibers / gauges.
I have shared this simple tip with a lot of folks over the years and the vast majority of responses have been from positive to very positive.
But, as in everything load related, there have been a limited few that said they observed little difference other than easier loading...still yet, if you haven't tried it you owe it to yourself to give it a try.
The type of wad does not seem to matter...from Vegetable to HBPE (such as Milk cartons) to plain old card board box, but cut to the correct diameter does seem to have an effect.
I have also found that a metric size punch provide a much closer / tighter fit. ie, for my .56 smoothie I use a 14MM punch, for my .62cal I use a 15.5MM punch, and for my .69cal I use a 17.5mm punch.
And, FWIW, my favorite material for this particular wad has become "Egg carton Crates"....there's lots of wads to be found in the top and side pieces of that little egg carton and they are very easy to cut, plus you're going to end up throwing throwing the whole thing away anyhow.
Uncle Russ...