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@Bearlegged
Shorter cranks help in terms of ground clearance when turning, but aren't the whole story... With shorter cranks comes less leverage, thus making it harder to push a given gear, so you'll want to gear down a bit. But then you'll be spinning like a loon once you get going - it's all swings and roundabouts...
On the upside, changing your cranks will mean you can move away from the 130mm BCD ones you've got at the moment to a smaller BCD and therefore open up more choice of smaller chainrings, thus allowing lower gears without having to find rear sprockets the size of dinner plates...