Ive only just Jailbroken my iphone 4 for the first time. The tethered part is a bit of a pain, is there a way to "downgrade" the OS on the iphone so I can use the 4.3.3 untethered JB?
Been the first time you Jailbreak I assumed that you don't have your SHSH Blobs save from a previous iOS version, so with that say the answer will be no.
Reference Links for you:
HOW TO - Save your SHSH Blobs using TinyUmbrella
This one show you a downgrade process even is not for your current iOS version is just about the same.
HOW TO - Downgrade IOS5 Beta Baseband 04.11.08 to 04.10.01