I will try a variety of aimings, but I think due to the shallow windscreen rake even when I tilted them up and in a little the low end still smeared across the screen somewhat, I tried about 20 different positions by moving and mounting the little ‘drum’ enclosure up and back to see how it effected the stage was not good until I got back to 20ish degrees off the vertical... any lower and side window and screen reflections kind of ruined the stage, I will try a variety of angles once I’ve made a 10cm deep by 35x20cm 7 litre enclosure with a simple hole in the corner and adjust the angles from there to find the best passenger side I can achieve in the position in the corner (I think I will use deadener to seal it up temporarily and adjust the angles forward and in) I will do this with my trusty laser aligner and a grid on the screen to ascertain the best angle and then be able to reproduce it after the test accurately
im also not adverse to different aimings left and right as you don’t sit symmetrically in the car so left and right may well be different