Having watched your video, I'd say use whatever you are using now! I like your playing.
Dennis makes a good point about 'having a reason to change'.
Here's an example: after trying various models years ago, I used 7A's for a couple of years - a pretty light stick. I thought anything heavier would slow me down! But my technique was a bit suspect. I was playing a bit stiffly, and holding the sticks too tightly.
Then I got some lessons that opened up my playing a lot, and improved my technique so it became more fluid, using a lot more of the stick's natural rebound. At that point I started to think that the 7A's were too light so I tried another bunch of models, settled on a 5A and that's what I'm still playing now, 15 years later. This is for pop, rock, funk, show music, all sorts really.
It has to feel part of you, natural, alive in your hands. For me that's a 5A. For a bigger guy than me, it might be a bigger stick like a 5B.