Sounds about right, don't waste your time or money cutting & turning axles. It is very rare to run into issues with a standard build like yours. Now if you were sprung under & doing SOA along with a lift you would need to consider it..
if you have 4.7's already, i would do the longs next. that is your next week point, and it is a quick way to put a damper on a trip when the stock one breaks, and it will break. I would go longs first, duals 2nd, and save the money for the hp for something else.
