Winding feel question

[FSUGeoff]

I have a Hulk and a D-Blue and as far as I know both have the same movement, but on the sub the winding is much smoother and louder, than on D-DBlue, anyone with both a Sub and Deepsea notice these differences. Sub was bought new and D-Blue used, I also notice I can wind the Sub faster and it feels more sturdy, when I try and wind the D-Blue fast it almost feels like the gears slip a little, if that makes sense. sShould I be worried, 4 years warranty left on D-Blue, but it keeps perfect time, only issue is the winding described above.

pics for interest