Wait a sec... Am I reading this right? You can do a toeside back roll, but aren't very good at doing toeside wake to wake jumps?
By looking at your bad of tricks, I would stay away from the whirly for a while. I'd pick up a ts front roll and a scarecrow first. Also, I would get confortable with all of my 180's. The you can take your rolls to revert. At that point I would do the Whirly. Landing a whirly and mastering a whirly are two very different things. I haven't seen you ride, but from what I am reading, I would get a little more seasoned before attempting it. Actually, you can attempt it all you want (and maybe you might land it...who knows). But, I would take a more natural progression and do the other basic inverts first. Good luck, in whatever you decide to do