OK, I believe I understand your intent. (By the way, I LOVE electrostatics but I haven't owned any for over 20 years, since selling my Infinity Servo Static 1's. I still have some old but sweet electrostatic headphones.)
A basic bit of theory applies to what you are attempting: the maximum power transfer to the load occurs when the source impedance (the amp) and the load impedance (the speaker) are exactly equal. If your amp was designed to tolerate both 4 ohm and 8 ohm speakers, the designer probably set the internal amplifier impedance at a compromise between those two values. In bridged mode, the two amps togather would (ideally) deliver twice the power to the same load as a single amp in a standalone configuration.
The rub comes in because we are talking about impedance, not DC resistance. Directly-driven ESLs (which I think include Magnepans) are a huge capacitive load, which varies all over the place as a function of frequency. Transformer-coupled ESLs have the opposite problem, they are highly inductive. The amp impedance expressed in ohms is a function of the frequency, and in bridged mode not only does the power double, so does the variation in source impedance (the bridged amps). Directly-driven ESLs have a higher impedance with lower frequencies, while impedance decreases at higher frequencies, and there is interaction with the amp internal impedance. Such a load is highly likely to cause a destructive amplifier oscillation at a high frequency (I have heard that high pitched, barely audible screech which often means either your amp or your ESLs or both need repair).
Making matters worse, the amp's power supply may not be adequate to deliver 2X normal current in steady operation. The minimum load impedance could have been specified with this power supply limitation in mind, even if the output devices can tolerate the extra power - hard to say without examining the design. Another reality factor is that unless the output devices of both bridged amps are exactly matched - not just within the individual amps but from one amp to the other - the amps will load each other with more instability the result. Very high quality amps intended for bridged operation have had output devices perfectly matched to minimize such problems.
Forgive me, but if you are unhappy so soon after your amplifier purchase, it seems likely you neglected the basic hifi test principal: audition the exact equipment combination you think you want, either in your home or at least in a very similar sized room. Make sure that all factors including maximum volume and amplifier headroom are satisfactory by playing demanding source material. Most high-end dealers will work with you and offer favorable terms and let you exchange equipment for little or no cost for a reasonable period (as long as they make the sale).
As for "overclocking" your amp - with the same combination of speakers and amps, I would not try it myself. The risk of damage is too great. On at least one occasion, I repaired my ESLs and amp togather, it hurt financially. In your situation, I would experiment with speaker placement within the room and in relation to my listening position, to find a more ideal solution. You may trade off other factors for more volume with room gain - such as a very small "sweet spot" when listening. In any case, enjoy the music!