I usually don't like someone telling me stuff that doesn't make sense, like 'tip your pinion angle towards the transmission', without any other explanation.
You can do exactly that if you use a double cardan style joint at the tranny output. They are a true constant velocity joint, so as long as all the angle is taken up there and the universal joint at the pinion is straight you're all good.
It would mean getting a new shaft made up, but if it means leaving the tranny mount and floor etc as it is it might be worth it?