The dyna booster I used did not require a condenser - but the condenser could be left connected to the points. The points act as a digital switch for the dyna booster (DC voltage) and the condenser is there for converting back to standard points use (when the dyna booster fails).
I would check the float bowl levels and the ignition timing. I would also consider running a can of fuel system cleaner through the engine - for no other reason than it will help clean carbon off the valves. If the ignition system works fine in third gear at 7k rpm, no more electrical energy is needed to operate in fifth gear at 7k. But, being thorough and meticulous in checking the coils can't hurt. Good luck!