The canard stall in a 3LS configuration greatly increases the static margin and adds a pitch down moment. A large elevator may be able to over-power this effect. The elevator stick force will rise for sure. Many years ago I designed a 3LS airplane with a Y tail and pusher propeller. The canard flap extended with wing flaps to produce no trim change. The deep stall problem is usually associated with aircraft with very large fuselage, and a highly swept inboard main wing. A T tail may just place the horizontal stabilizer deep within the wing wake. The DC9 super 80 did a spectacular demonstration of this during flight tests. Should we design a little lift bump in the wing of a conventional airplane to be cancelled by the negative lift of the tail?