Were you shooting with 777 powder, and was there a crud ring in the breech?
Were the cleaning patches tight enough, and what solvent was being used to swab with?
Was the sabot too tight even at the muzzle?
The TC's are said to have slightly tighter bores so they're slightly more susceptible to fouling when using some sabots.
Depending on whether plastic or powder fouling or a crud ring was a contributing factor, a better solvent, a plastic bore brush or tighter fitting cleaning patches could be used to clean better between shots.
There's also easier loading sabots that are available from MMP that can be swapped with the existing sabots. There's different sabot diameters, petal designs and lengths.
Easier loading Powerbelt bullets that only have a plastic skirt are another option.
Also using a good starter and a stout ramrod with a handle, along with a mallet to gently tap the bullets down the bore can be of great assistance when loading tight fitting sabots.
Sometimes a final patch lubricated with a very small amount of TC Bore Butter will slicken up the bore just enough to aid loading. After the powder is dropped in, only lube the top 1/3 to 1/2 of the bore.
http://www.mmpsabots.com/