I need to adjust the timing on my TR6 PI and have read so much about settings I have confused myself totally. I have ordered a strobe and will be using this, it seems the setting for this should be 4 ATDC (vs 11 BTDC static). Have I got this correct? Also, I have heard that it can be useful to adjust timing slightly to cater for modern unleaded fuel but not sure if this is correct or if so what adjustment should be made. Thanks.