I can’t increase quantity step

Hello everyone! I am working with WooCommerce shop for my client and I got stuck with problem regarding the quantity of products in cart. I have used your plugin before for some of the clients requirements and I loved it but I am not sure if this can be done. I want to increase quantity step and it would be different for every product. It is for Ice Cream factory and the owner wants to track everything in kilograms but his clients are ordering for example product of 5.5 kilograms. For this example quantity step should go 5.5 and then 11 and then 16.5 and it should let clients order decimal number but WooCommerce keeps rounding it on full numbers inside cart. How can I make it work with decimals in final checkout? Can this be done with your plugin “Product Fields, Addons and Price Calculator”?