twisted stickers (acrosonic)

[J Patrick Draine]

List,
My customer has a 1968 Acrosonic with the long wooden stickers (the 
ones which a conventional capstan pushes up on). The piano was tuned 
intermittently, til the mid 80s by a gentleman recently retired. The 
lady of the house is also recently retired, and ready to return to 
playing piano & having the grandchildren learn on it.
So ... this spinet was 100 cents flat, and suffering from various types 
of "sticky key syndrome." She informs me that's "always been a 
problem", as the previous tech had apparently "tuned but  did no 
repairs."
The general sluggishness is mostly attributable to the key bushings 
wrapping around the key pins. Several keys, however, were sticking 
because their stickers were twisted severely to one side, and the 
capstan was jamming between neighboring stickers.
I'm a bit puzzled as to the optimum fix for this problem. There 20 
stickers that are off center to some degree, while 6 of them are 
severe. I took several out and there're not obviously twisted (and the 
center pin appears properly aligned though I didn't try repinning). I 
*forgot* to swap some stickers to see if the problem is where the 
flange cloth-and-center pin pops into the wippen. The wippens 
themselves are properly centered (ie in relation the spacing of 
neighboring wippens).

So -- assuming other have seen this problem -- what's your optimum fix? 
I tried twisting with heat but that didn't seem to work. Steam? 
Kerfing? Replacing wippens (not my preference  but ....)?

Thanks,
Patrick Draine