One thing you may want to consider if the builder missed his target on head tube angle...is why. There are a few different methods of building frames out there and question is...what did this builder do or perhaps not do. If you pre-cut correct frame member lengths you can many times hit angles within a particular tolerance. Some angles of course are more important than others and it really comes down to what type of fixturing he used to insure angles are just right...you may want to ask him about that.

Its pretty easy to back out the steerer tube angle based upon a fork rake of 43mm using the above equation if you have a target trail number in mind. You mentioned you liked how your previous bike handled...strive to replicate those dimensions. 73 degrees is a nice target...but you may prefer the quickness of 74 degrees as Galen suggested...particularly on a long bike which slows things down just a bit. Also listen carefully to your frame builder because designing a frame is a puzzle...dimensions are related...toe overlap...front wheel clearance to down tube...head tube angle affects reach marginally etc. Ideally you don't want to design a frame around an existing fork but you will need to double check the length of your new steerer tube to make sure your fork tube is long enough as your large steerer tube length may end up getting tweaked a bit depending on how the designer sets up the frame.
Keep us posted and Best of Luck,
George