The Evos are not boring, they should be the best 4WD cars, they are so fun to drive because you only have to focus on getting the lines right, not regulating the throttle and steering in unison the whole time like in most cars. Sadly due to their awesome chassis and suspension setup at stock, and the computer assists that come pre-programmed into the car, it gets marked up on PP. So in the 750PP races they are grossly underpowered, even the GT tuned ones.
So yes, the Mines is the best, but only because the Evo X is underpowered at high level racing. The Mines can near 600bhp in a 750PP event, but the Tuned Evo X only managed 520ish, with similar weight.