You know I had this issue a while back but it was not for residential. It was an on-off head and tyco told me to replace it with a standard concealed head. (makes you wonder why)
Your question could solve lots of peoples problems since Tyco-central got sued for the manufacturing of the heads and now they wont recommend any proper replacement since they did not plan for that law suit.
Good luck men. Keep me posted
I believe that Viking and maybe Reliable have a K3 sprinkler, but it is only for 14' max spacing. It is not a 0.03 density, but may be workable if spacing allows. You may just have to recalc the system with a new sprinkler and see how it does.
