Your experience with asymmetrical drive is the other reason, besides inherent stability, that I strongly prefer a two front / one rear trike geometry. If one is going to have two rear wheels, both have to be driven, preferably with a proper automotive style differential, but at least with a ratcheting freewheel mechanism on each, which still has the unfortunate characteristic of putting all of the driving force on the inside wheel, but at least the effect is symmetrical.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069