This rig has some serious impedance mismatches that could be hindering your tone. The Vox Bobcat is a passive guitar, and you're throwing it into an Ampeg SVT, which is primarily designed for bass frequencies. The JHS Morning Glory will have trouble driving the Big Muff op-amp, especially since the Muff can be very aggressive. Consider introducing a buffer after the Morning Glory to maintain signal integrity, and swap the Big Muff for a pedal that can handle the range better, like a Tube Screamer, which will interact more musically with the rest of your chain.