I don't know equivalent levels between creams and shots but with injections most get well into the upper range with 100mg weekly. I've never seen anyone claim to have preferred the effects of the cream to injections. I've never seen anyone go back.
I would say that splitting a weekly dose into two injections is preferred by most and the difference for me was significant. Many also use a 29gauge insulin pin 5/8th inch. Draw with a normal syringe, pull plunged out on slin pin and backfill it. Look up Ulter Slin Pin technique. Not good for glutes but if you are lean in quads, delta, traps or pect it's nice. Less waste (3ml syringe wastes about 1/10th ml in tip) and less scar tissue buildup over time.