My Opinion
I'm your height and 50 lbs heavier. I switched to the 440's but got HD and 13" length. They preloaded them too much and it bottomed out too easily. Had them adjust one complete turn and now they are close to being right. Probably one more complete turn should do it.
I probably could have gotten by with the OEM shocks from Triumph. The only difference I've noticed is when I really get on it....... the 440's seem to "Hunker Down" a bit more and really put the bite in the rear tire. With the OEM's, I'd get a little wheel spin. Ride wise they seem to be about the same. Though I like them, if you're not going to be leaving the stoplight at Warp 7, probably you'll get by fine with the stocks.
Just my opinion.