Checking my 95 FSM, torque values for a removeable hardtop are:

Front hold down screws  17N.m (13 ft. lbs.) 

Rear pin mounting bolts   11n.m (97 lb. in)

Rear oin mounting jamb nuts  28n.m (21 lb.ft.)

Roll bar to B pillar bracket bolts 35N.m (26 lb. ft.)

B pillar bracket mounting bolts 25N.m  (26 lb.ft.)

 

Assuming that there is little/no difference between 95 and 96 specs., you can see that it's not a ton of torque on these bolts.  I'd torque to correct values and then see if anything happens.   Face it, most of us have a tendancy to overtighten everything by hand, so you have to establish the correct baseline to determine what might be the cause.  IMHO, that's find out if it's ever had accident and torque to correct values.  A carfax and a torque wrench will cost far less thn a new windshield.

Let us know how you make out, curious to what the answer is on this one. 

LBzr

As mentioned in Adams Apple reply, I believe the torque values could be the issue. I am of the old school of tighter is better. The windshield frame torque is quite light even compared to the others. We shall see. I have two cracks now, one on each upper corner, so I don't really expect more. I don't plan to replace the windshield unless I sell the car and that doesn't seem likely any time soon. It is a sweet ride that is somewhat unusual in that it is a Collector Edition with the torch red interior and LT4. It was featured at the Museum caravan weekend as an example of the end of model run for C4s. 

LBzr