Bread-Bakers v096.n040.8

All you need to do to preserve texture of your additions to ABM is:

Figure out how long your second knead is.  Next time you want to add
something, set timer for 7 minutes less than knead time.  Add ingredients
when timer goes off.  Most machines have "beep" at five minutes before end of
second knead, but I have found they incorporate better at 7-8 minutes.
 Longer produces mush, as you have found out!

HTH!

Jean