how is the 32k signal coupled to the t1clk ?

if I recall correctly to sync the t1osc with the ext signal the coupling needs to be a capacitive
one . try about .01uF
make sure the other xtal pin is not loaded up either, or you may need to drive that pin too
can't remember.
why not just put a rock on it anyway, there're cheap

google up using tcxo with pic to get some better info