help help new to the game!!!!!

ok so im new to the whole bagged thing so my truck is on air bags with nitrogen... i wanted to change to compressed air for my horns and so i dont have to pay to fill the bottles up which are kinda pricey... so any ways i have a 12 gallon tank with 2 viair 480s runnin a 200 psi switch anyways i got all of it hooked up when i go to fill the bags the back pops right up but the front will only lift about half way up compared to what it did with the nitrogen,,, now the truck has a cummins diesel in it which is def heavy but my front bags only run at about 65psi each at my set ride height.... sooo i dont understand why it wont come up like it did with the nitrogen.. now naturally the nitrogen has a ton more pressure, but i figured 200 psi would be more than enough to pick it up??? please anyone one with the same set up and or had the same problems it would be greatly apprieciated, i am new to this so i really dont understand all the aspects of the air systems.. so be patient with me ... thanks rick

What size airine are you running? I had the same problem with my old s10

Are you sure there is 200psi in your tank? Is you pressure switch working correctly? I never have had good luck with any of them. I have one from a shop air compressor on mine now, very dependable and adjustable as well. Bought it for like 5 bucks on ebay several years ago.