The particle pearl r2s cover allows it to perform on any medium type lane condition, however, as this cover creates some friction in the oil, it's not enough to handle heavy and long oil patterns. Surface adjustments will help, but will only be a short term solution.
Personally, I'm not a Shift believer and don't use it much. Also, mine cracked and it wasn't the driller's fault. Anyways, I'm with Dan, the T-Road Pearl is an awesome compliment to the SA. When I get busy, I stick to the Special Agent and T-Road Pearl for all my needs.