Scooter, you ask about bad habits (which implies you are new to the Yak52)
but then say you doing inverted spins which implies you are experienced with
aeros.

So a cautionary word may be in order - in case you start stepping up the
range of aerobatics you flying before getting Serge or whoever to fly with
you and provide type specific info:

Get the dual type instruction before playing with any advanced spins and
ideally even before playing with verticals (as per DOSAAF procedure)

The Yak52 takes a long time with resultant altitude loss to get out of a
flat spin.  You can't punch it out.  Some (2 I have flown so far) will not
recover using the recomended methods and anti-spin inputs.  This from either
a flat spin to the right or an accelerated aggravated spin to left. (outspin
aileron and stick forward).  On the one aerie we dropped over 3000ft after
initiating recovery with no signs of recovery.  She really winds up as well
and some people find this disorienting and may have difficulty thinking
about which anti-spin inputs to use.  Compounding this is the time and
number of revolutions required before "stopping" the spin, I think some
people have after putting in the correct anti-spin inputs decided they did
the wrong thing and THEN do the wrong thing.  The stick and rudder forces
are also quite high and you might think you have them to the stops when you
don't, and you may not recover.  Also must check rigging for correct travel
before playing with these.  During recovery you also never stop rolling so
may miss the point where the spin stops (but not the rotation) and do
crossover into inverted spin.

The Yak is great and has no bad habits in terms of departure or conventional
spins.  But flat and accelerated spins need some prior training, forethought
and lots of altitude.

Bottom line:  Do not play with these without excellent dual first.

Jorgen