Ride height

[Allan1875]

Quite embarrassed asking stupid questions like this but it's the only way I'm going to learn.

Been looking at various setup sheets and noticed that a very common ride height is 21mm at front and 20mm at the rear.

Here is my problem. I currently have a b44.1 with ae silvers on the rear and kyosho silvers on the front.

With the rear shock collars wound to the top the ride height is sitting at about 26-28mm, how can I lower this? Are the figures on setup sheets done with setup wheels on as I am taking my measurement with mini pins on.

Thanks for any help, steep learning curve for me buggies and there will be many more daft questions to come.