Mentioned this many times before, but try having a 2X4 or a pair of 45's under the heels when squating. Less stretch and the qrads are hit strongly. Front squats work very well this way. Any form of squating, with heels raised, give better balance to a lot of guy's. Olympic lifters have raised heels on their lifting shoe/boots, balance being one of the reasons.
Guy's into serious sports are better served by doing regular flatfooted squats because of the better flex/stretch to thefoot/heel/ankles. Good Luck.