Realistically for your size the W44 is probably best considered a board for powered 5.5m (speed) conditions and windier. It's actually easier than expected to get started (for a board of this size) and the relative volume ensures a pretty efficent "carry" thru lulls on the course- as well as good acceleration to pick off gusts mid run, but in speed conditions up to about 40 kts of board speed you'll probably find the W49 a more versatile range for bigger riders (which obviously overlaps the majority of your range on the current 48cm). The 44 does well over small to medium speed chop (and rolling swell as is common on broad speed courses in higher winds)- and has a safe and encouraging rail, allowing the rider to "push on" confidently in chop conditions when you would be thinking about taking it a bit easier..
yes, in 30-40 kts, it is a blinder!.
Cheers ~ Ian