None..
Have not flown a 421 in many years, but do own a 411A, a great machine at one third the cost. Our company now also leases a KingAir...even better. If things go according to plan, a JetStar will not be far behind.
And your comment about not using reduced power for takeoff...absolutely correct. If full throttle travel is not used, the additional cooling fuel is not available...for cooling. Not to mention not having full power available if one engine fails.