Cool to see you online here Stu... lots of differing experiences to draw from as promised.
I understand that the price of BEST lines is about $245NZD incl Tax and this is a factor for you but before you write off BEST lines... lets not forget 2 key elements that have caused the damage in the first place. As without changing both of these practices the accelerated wear may continue and there is still some good life left in your rig. ...just don't jump behind me
Don't underestimate the chaffing caused by riding with twisted front lines.
Regardless of your line brand you should not ride with twisted front lines as when you smack in the stresses and shock loads are no longer evenly distributed. The lines chaff and wear.
Solution... try doing as many front spin as back spin tricks on the same tack to avoid excessive front line twists.
You could also consider changing your bar configuration to one with wither a front line swivel that works or one with an under bar swivel you can unwind yourself.
If upgrading the entire bar the height of the front line Y has a direct relation to front line twist.
Also having inspected your lines at the beach and seeing the way the sheaths have worn.
It looked to me like when you make a larks head loop that the extra little twist is left in the sheath. I always roll this off as it would be under extra stress if left in place. (Does anyone else do this?)
Anyway what ever lines you try next, try improve setup technique too.
It might just save you more $$ in the long run.
Just my 2 cents mate...
Oh, some guys wax their lines... but I have no experience with that technique.