The sub floor ballast you can't burp like that so I fill until it over flows out the side but those bags will still have air in them as well. So the best you can do (to my knowledge) is to just keep topping them off periodically throughout the day because they have those little flat check valves on them so they will just bleed the air out slowly. The sub floor bags are the ones I want to find a solution to.
You're saying the Makai stock rear bags have an additional connection to a midship/subfloor bag? I did not know. Is it plumbed straight of the front of the rear bags?