1-your speakers are efficient enough that you won't need the extra power.
2-The extra wattage will only get you a 3db increase (10db to double the sound pressure/perceived volume).
3-Usually the speakers efficiency will drop with impedance and distortion may grow. Many 4 ohm speakers are rated at only 84 to 86db, while your klipsch are rated at over 90db. Therefore, even if you rewired your klipsch for 4 ohms, the efficiency will drop enough that it isn't worth the gain.
IE... your amp may put out 100 watts at 8 ohms, 200 watts at 4 ohms. 100 watts at 92db will be louder than 200 watts at 87 db.
