I am continuing a full gut update with many improvements to the energy efficiency and air tightness of the structure.  I have struggled with how I will most efficiently install the Intello I am using for a ceiling air barrier .  Tonight I started releasing the trusses from the top plates to slip a strip of Intello between the trusses and the top plates.  I am using a thin reciprocating saw blade to cut the nails that were placed 28 years ago.  It seems like it will be much easier to get a consistent barrier like this than to do all the rooms as independent spaces.  

My question is what is the best way to reconnect the trusses and the top plates.  They have been directly attached for nearly three decades, and I could use nails or construction screws to reattach them as before.  When looking around for a solution, it seems like the idea of having them not touch is popular, and there is a special screw to connect them with room for the truss to go up and down with conditions through the year.  I have also seen the bracket that is connected to the top plate, and a nail is placed in the truss that rides in a slot to allow up and down movement.  

Any suggestions about how I should go forward?  If I have the chance, I would like to do what would be best for the next 30 years.