I have a Viking Vikore, a Viking ExactShot X2, a Jacoby Edge Hybrid and a 314-3...all on Viking Butts and all 19 oz total.
The Edge and 314-3 are my favorites but honestly none are dramatically better than the basic maple shaft on my $50 Rolling Rock advertising cue. I've seen some glowing reviews of the HP, but doubt the Joss is much different than the shaft you have now.
For a few hundred bucks though what the heck, give it a try. When I find one I like I just demote the old one to live in the car or truck for the odd time an after work session comes up.
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