Accu-just hitch pins and tuning stability

[Andrew and Rebeca Anderson]

Any old-timers out there with hints on making these more stable?  The 
two in my customer inventory both needed huge pitch 
corrections.  They were more work than most other pianos I work 
with.  Maybe I need to adjust my hammer technique a little.  I will 
suggest keeping them in tune for greater stability.  Ie. major pitch 
correction, 2 months regular tuning, four months regular tuning, then 
every six months etc.  Any other ideas to add to the mix?

Andrew