The aftermarket brake kits are made to equal stock brakes, and not to dramatically increase braking power. That's due to liability worries. When I built custom brakes for my SUV, I researched and asked for guidance from several people in the industry. Todd of TCE was the most helpful, and he got me the custom rotor hats I needed.
The first attempt I made with 65-82 Corvette calipers was good, a little more than stock brake power. The aftermarket would have chosen smaller pistons, such as the SSBC units I went to next as a slight reduction(45mm pistons versus 1.875"(about 49mm). This is very close to ideal, nearly stock but a hair more, but, the pad sizes are too small for heavy duty use. Try very very hard to put pad size and quality/choices, as the top priority for any brakes. You don't want to have to do brakes two or more times a year.
What I built is for any 95-01 AWD/4WD Explorer, but the updated 01+ Sport spindles for the 2nd gens, will allow a 1" larger rotor. So the stock 01+ Sports have 12" rotors instead of 11", a common idea Explorer guys know. So if someone had a crazy heavy wheeled truck and needed lots more brake, I could point them to the same parts, and they end up with 13.75" rotors. That would be way too much for any stock type truck, but it's the kind of big brakes large F-series trucks use.
You need good balance in your brakes, not too much, never less than stock, and with plenty of pad life given common parts. High end rotors can last for ages, pads never do.
92 Mark VII LSC SE - soon OBDII and 4R70, GTC kit and 347, custom paint.
98 Explorer Limited project to add 4WD, XP8 parts, KB blower, paint, 337.
99 Limited mail vehicle, SOHC 4WD, later 306/4R70W swap. 1998 Mountaineer spare. 72 Ranchero 351 Clevor project.