Problem With ADT System - Need Advice

[aworkinprogress2112@xxxxxxxxx]

I'm looking for some guidance on a problem I am having with my alarm
system.  Back in July ADT installed a Safewatch PRO 3000 in my home and
I've been having false alarms ever since.  The home is a three
bedroom cape with PIRs and door contacts only; three door contacts on
the three first floor doors, two PIRs on the first floor which cover
two rooms each, and one PIR in the basement.  The way the system was
installed/intended to be used is since there is protection on the
basement level and the first floor and I arm the system "Away" when
out during the day and at night because we sleep on the second floor.
Since this system was installed I have had false alarms just about once
a month, but ALWAYS when we are away and ALWAYS from one of the first
floor motion detectors.  I am sure the false alarms are being caused by
our two cats because we never have a false alarm at night which is when
the friskier of the two cats is ALWAYS locked in a bathroom or else he
wakes us up.  In addition, none of the door contacts have ever alarmed
and the one PIR they do not have access to in the basement has never
falsed.  ADT came out once and changed the two motions but the problem
continued.  They came out a second time and agreed the false alarms are
being caused by the cats but can't seem to prevent these without
changing the system around.  My argument though is that I paid for pet
immune PIRs and was told they would not false alarm because of where
they were being installed; far enough away from furniture where the
cats could not climb.  One time when they came out they tried
"masking" the PIRs but said "an elephant could walk by them and
not set them off" so they didn't do so.  The only option they've
provided me with now is to change the PIRs to glassbreaks and to put
contacts on the windows which would cost an additional amount above
what I wanted to spend in the first place.  I am going to use that as a
last resort but I really want the system to work as installed so I am
avoiding that route until I've exhausted all other possibilities.
Any ideas?  Can I simply replace the PIRs with a less sensitive/more
adjustable device?  Are other PIRs even compatible with this system?
Any suggestions/comments would be appreciated.