Scott - I'm glad you mentioned that... I thought it was just me but I seem to have problem with grey as well. Wierd...
CJ - on my 155 where I HAVE to put the needle in from the back (it has a ball on the back end of the needle) I grab the needle just behind the bevel up front (about 1/2 inch back from the tip) and insert it into the opening of the AB from there.. then I just move my hand back and put it the rest of the way in... There's a lot more control and I ding the tip less that way...
And I ditto Scott on the needle lube, if you aren't already using it, it really makes things easier as far as tip dry and paint sticking to the needle. It is extremely effective with acrylics but helps a lot with enamels as well!