1/8" works for me too. I use a looser patch (.010") with .490" round balls. The patches get shredded pretty fierce without a wad, pretty much blown apart, and the accuracy looks like a shotgun. As soon as I started using a wad, and dropped my powder charge a hair, I got really great accuracy. I repeated and proved my accurate load today, besting it a bit by using a scale to measure the powder charge down to the .1 grain, and changed my loaded procedure a bit, and got 3 balls touching at 54 yards with open sights. Now with my Lee REAL 320gr bullets, I tried wads with those, and got poor accuracy, BUT, I haven't thoroughly tested them yet. I didn't even try a wad with the 90gr loading cause it shot quite well without it.
What i'm basically saying, is give it a try. If it doesn't work, the cost to get a bag of 100 wads to try isn't going to set you back hardly anything.
Branden