Trimming up the Elevator Trim manually or even turning on CT ( this is what u mean when u say u took off your manual trim, I am thinking.)
will help you gain better control, when fighting SLOW........( IMO, it is what works for you best, CT on when slow can hurt you(me) sometimes plane type dependent)
did this help you win the fight? or was it you controlling your plane better than the other guy? who was also bleeding his / her energy the same as you were. Although you trimmed up your plane for the slower speed, does not mean your opponent did not already have his CT turned on to begin with.......it means you managed to control your plane & E better to gain position
Flying the merry-go-round fight, if you have played this game any length of time, is easy to spot.....as soon as you find yourself flying/fighting in a flat turning merry-go-round fight ( I do not consider this a knife fight by the way ). You should get out of sync, position to fly high yoyo, shallow low yoyo manuevers, let the opponent keep turning the flat turn.
I sit and watch in CM eye mode players in KOTH get into fights, some go round & round & round & round add infinium.......the better players realize what is going on. The first to break the cycle and starts oblique turning usually 9 out of 10 times comes out the victor, simply because he used what he has learned.......both pilots being in the same plane type, both using CT ( Combat Trim )...the deciding factor flying for position verses playing merry-go-round(flat turning ).......
edit: I consider a knife fight as flying near edge of stall, low speed end of the flight envelope, using maneuvers as yoyo's, scissors, etc.......flying so close just before colliding yet not able for either to gain a deflection shot, or something like that