OMG, simply remove this Zobel network from your circuit. Because you are building power amplifier, not a crossover network.
Sometime we use a Zobel network/Boucherot cell at the output of an amplifier, but in your amplifier this network is not needed .
Please read this:
http://www.eetasia.com/STATIC/PDF/200810/EEOL_2008OCT16_ACC_POW_TA_01.pdf?SOURCES=DOWNLOAD (page 5 Output network).
http://sound.westhost.com/amp_design.htm (starting from Output Stage Stability).
Sometime we use a Zobel network/Boucherot cell at the output of an amplifier, but in your amplifier this network is not needed .
Please read this:
http://www.eetasia.com/STATIC/PDF/200810/EEOL_2008OCT16_ACC_POW_TA_01.pdf?SOURCES=DOWNLOAD (page 5 Output network).
http://sound.westhost.com/amp_design.htm (starting from Output Stage Stability).