I have the same thing. My right leg is larger than my left, yet doing OLP it wears out first. Maybe one leg is longer than the other. Put alternate heels on the pedal and back pedal on the trainer. Is the reach the same? Mine are different, about 1/4". In any case, OLP helps, and it will really help your seated climbing power. I've been doing 2 minute OLP intervals for a few years. I think this year I'll try to go to 3 minutes.