Brown the meat before adding it to the crockpot. Skipping this step produces a greyer, less flavorful meat base. The browning develops flavor that the slow cook alone cannot replicate.
Break the Boursin into several pieces before adding so it melts evenly and quickly into the sauce rather than sitting as one large chunk that takes much longer to incorporate.
Stir the pasta once halfway through the final cook so it cooks evenly and does not stick to the bottom.
Wheel pasta (rotelle) is the right choice here because its spokes and shape trap the creamy sauce and hold the meat in every bite.