Scooby got it right.

When snuffing, do so with speed and heat in the spinnaker. Running over the sheets or having them twist around the end of the pole is common if you are snuffing while heading dead downwind. Secondly, hold a little tension on the dousing line (belly chord) just prior to releasing the halyard - this helps to reduce the power in the spinnaker immediately after releasing the halyard by getting it to fold immediately.

With regards to the snags - I think you'll find that the spinnaker snuffs much easier when snuffed from a proper sailing angle. You probably only have two snuffer points - but you might be able to put a stopper ball between the two collection points to separate them slightly. I have a mid-pole system but I put a stopper ball about 16" between the mid patch and the top patch in the spinnaker just to keep the whole bunch from trying to enter the snuffer at the same time. You only need to make sure that you can snuff the entire spinnaker with the extra length added by the stopper.

We set our halyard / luff tension so that when fully hoisted and with little wind, you can grab the luff of the spinnaker with a full fist (vertically) and rotate your closed fist containing the sail luff to horizontal to make the luff tight. We set stopper balls on the halyard and/or tack line so that this setting is easy to achieve blindly when hoisting.