You do not need speed to carve and the best can make very slow carves and very easily stay under 15 mph. But if you would be more comfortable in soft boots for now them there is no doubt it is possible to carve well in a setup like yours although those boots will not be the best. There is nothing wrong with staying in softies! Experiment with your angles a bit, try a forward stance but at low angles and work up, typically you will want the front foot at a higher angle than the back. The forward stance can really help you to make better carves without slipping as much.
As far as similarities go with your board and a hardboot setup, well they are both snowboards that's about it even with hardboots on your board it will not ride like a harboot only board. But that's not saying it's not good or can't carve, I know guys that carve very well on similar boards. Also your board is Camber and that is best for carving!