first, regarless of whether or not its true of false that nolva increases progesterone related side effects, it should not be used on ANY cycle.
muscle growth is based on the tearing down and rebuilding of muscle, nolvadex greatly inhibits muscle to break down in the first place, therefore inhibits overall growth. For ths reason, endurance athletes use it alone to decrease muscle fatigue.

second, whether or not nolvadex causes increased side effects, its still not a great choice because we have BETTER choices. letro is much more effective in controling gyno/estrogen/progesterone, why use a sub par tool?

third, i do believe that nolvadex stimulates pgr. this theory is based on the idea that by crushing estrogen, progesterone related side effects are impossible.

fourth, even if this was true, that means one would need a dosage of nolvadex so intense that estrogen is crushed COMPLETELY, which is unhealthy and will inhibit gains further