GOOD NEWS! I have found the real source of the problem and I;m sure you have all been dying to find out what it was :P
My Problem: Bladder constantly blowing out on the leading edge
Source: The stitching of sleeve that sits in the end of the leading edge, that you fold over to secure the bladder, was coming undone. This was allowing a space to form between the leading edge and the sleeve which the bladder would expand into and pop.
Fix: Ensure the sleeve is sewn properly into the leading edge and that there are no gaps between the layers.
If your sleeve is wrecked then a piece of nylon cloth should be a suitable replacement. Sew a velcro pad onto and get it sewn into the leading edge. You're essentially making your own sleeve so just copy what you already have, this is just how mine is designed. There is a bootmaker in corrimal (
www.truelocal.com.au/business/cg-lewis-bootmaker/corrimal ) who has the sewing machine required and will do it for $10. You do need to glue the sleeve in place before it can be sewn so that the machine doesn't pull it out of place, do that before you go there.
My "Fix" (Temporary): I have already got mine sewn back in but I had glued mine too far up the leading edge and now the diameter of the sleeve was smaller than the diameter of the leading, leading to a cavity between the two surfaces. To fix this, I cut the sleeve where the cavity was to essentially create a flat sleeve. I then got a woolies shopping bag and cut the bottom corner out of it, at around the same size as the diameter of the leading edge. I then put the bladder inside the woolies bag and the woolie bag inside the sleeve, then fold as normal. This stops the bladder from expanding out down the side of the sleeve where you made your cut.
Hopefully this helps anyone else who was having the same problem as me or is need of a quick fix. I haven't tested my fix on the water yet but it worked when I tested everything in the garden, so fingers crossed. I'll update you if there are any issues.