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Good parts man.
That's an OE part number, the 2200 designates a rear disc pad. The AA were an modification during the maturing of the vehicle platform, utilizing a change in the noise insulator to address rear brake noise while still maintaining the original friction material.
The edge code on those pads would have been FM6091EE, designating it as Federal-Mogul's 1222-1A friction material, with a cold/hot friction rating of EE. With the 315/75 tires on the vehicle your exceeding the design parameters of the brake system, and I agree the OE material would feel lacking. You need a material preferably with an edge code of FF. (Edge codes are not the end-all of knowing how a friction material will perform, but it's the only consumer rating that materials are identified with.)
That MSDS, like all MSDS list the most worrisome chemicals without disclosing ingredients that would hurt a companies proprietary formulation. Most friction MSDS cover a range of friction materials rather then one specific one. There are about another dozen ingredients in that formula that are not disclosed.
My confusion when you stated "premium" was that you got one of the Motorcraft aftermarket pads as these two parts, as an example, typically carry these designations:
BR1266 STANDARD PREMIUM
BRSD756 SUPERDUTY
__________________
Jack
Former Vehicle Test Manager - Friction Products
03 F350SC 4x4 6.0 Auto 5/30/03
Truck Modifications below in Pictorials on Facebook. Search in Google - Facebook TooManyToys
Step Lights;Painted Flanges; Bypass Oil Filter; Heated Mirror Switch; Reverse Lights; 7.3L Fuel Reg Shim; 6 Disc Radio Speed Volume Mod; Coolant Filter, etc.
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