6703 Ultegra triple is 52/39/30. There is no 42t ring available from Shimano since the 30t uses a 92mm bcd and bolts directly to the special 39t ring. Shimano stopped speccing 42t middle rings after 9 speed.
I have two 6703 cranks, a 170mm and 172.5mm. Both have the noisy 39t rings while in the smaller cogs. It doesn't bother me though the sound is there. I also have a 2010 FSA SL-K triple. Its 39t ring is a lot quieter in the same cogs but the 52t ring is no where near as nice as the Ultegra.
I spend about 70% in the 52t and 15%/15% in the 39t and 30t. For rollers and grades to 8% I'm in the 39t and for longer stretches above 9% I'll use the 30. 30x19 is just a tad harder than 39x25, it's one of my favorite climbing gears.