Uh, the B100R is a VERY mids-heavy amp. Many players prefer running it with both mid controls all the way off, bass and treble WAY up, and bass boost and mid scoop activated!
That said, you have to trust your ears, so there's nothing wrong with adding more mids using a pedal if you see fit. If you want to boost mids with an SFT, you have to turn both low and high EQ controls down, and increase output for the boost, gain to taste. Heavy gain boost the mids, but (obviosuly) with distortion. to compensate for that boost and go flatter, turn both EQ controls UP and adjust to taste