Ever thought about using drennen powergum £2.95 per 10yd spool.
Comes in red or clear. Just tie a 3 turn grinner knot and cut off the tags. Makes great stop knots and you can adjust them up and down the rig. Use them wherever you would use a crimp.
Also they don't crinkle the line like rubber tubing.
I always use rubber float / gummi stops (and whatever else they might get called) for my rigs - They're the way forward. Punch it into Ebay and go for the larger sized ones - they fit on 60lb leader no worries at all.... So do the medium sized ones, but a little more fiddly. Hope this helps