Insulation help for my garage with pics

I think I would just go with a flat ceiling,but I would put a 2x4 in the center from the ridge to the bottom chord.then take a 2x4 from the bottom-on a 45,back up to the rafter,from there a 2x4 on a 45 back down to the bottom chord.When finished you should have a center post and an inverted W in the truss.Do this to every truss and you wiil strengthen your roof x 10 I usually drill the soffit with a 2" barrel bit,you can buy inserts at Lowes or home depot,Good luck,If you have a question just let me know. I see!You are trying to insulate just your rafters-you have got a job ahead of you.Make sure that you drill your ridge board too.If you dont the air will pocket at the ridge,and will not circulate.You will still need the webbing,maybe you can get your girlfriend in the rafters and you can cut insulation for her?eh?