When using partial ROM to help a particular lift, it's important to know which part of the lift is your limiting factor. If you can't get more weight off your chest, working partials for the lockout is not going to be as big a help as working on the weak area. There are auxilary excercises for each part of the bench press that you might look into also. What part of the lift is stopping you?
I will sometimes use a smaller increment in weight also. My spring clips are about 2 lbs total. I don't usually use them, but will throw them on in a case where I need a smaller than 5lb increment to help get on the way. Sometimes these things are mental barriers also, and knowing I just lifted an extra 2lb will help break through.
Good luck and keep us posted. 207 for 1?