Two very good responses already, both from Altune, and from sp2816.
I concur completely that you need to check each cylinder for V/P clearance and for deck ht. IN today's world it is difficult for me to think that any good shop, much less a shop of high reputation would possibly not be sinking each valve to be identical. Now with the newer Sunnene and the Srdi attachments and the Serdi machines it is almost a given that each valve seat will be identical in cut and in depth. Still it does not hurt to check them.
Possibly if you are running a tight V/P clearance tolerance you could be getting a tolerance stack with the piston being jst a wee bit taller in the deck and the vlave margin being jst a wee bit thicker and they collide. Not likely but possible.
Unlikely but possible is that the crank rod journals are not in complete index and the piston is in a different position when the valves are in overlap on the affected cylinders. That is not likely but is possible.
Like was said earlier check the camshaft to se if a mistake was made and the lobes are not all the same. If your T&D Rocers have the same number stamped on them, I can pretty much assure you they are right on.
Does your engine require different length pushrods in the different cylinders? If it does and you got them mixed up, that could change the rocker geometry and perhaps the lift in some cylinders. Yep' I know that is stretching it, but we are guessing at possibilities.
Like was already mentioned it is unlikely that your .005 deck is ecatly a .005 in every cylinder. So the affected cylinders could be just a little higher. Everyone does not check piston deck ht the same either.
Last but not least are the valve springs.
I would be using a better spring with that much lift. You did not mention what your on the seat pressure was but by your open pressure I am guessing they may be low also. If perchance you are have some vlave control issues but not bad ones, and for whatever reason those valves are closer to the piston, then possibly those are touching or hitting and the others could be very close to doing the same thing.
If your cam is a mainline camshaft company cam, I can tell you that their recommended spring pressures are at the best marginal of what is needed. If you have a speciality custom ground cam, then you should be able to follow the cam grinder's recommendations for it.
Along the subject also of valve springs is valve spring set-up. If the springs are set-up too far from coil bind you may be experiencing spring surge and when the springs suge there is nothing holding the valve closed for a few brief split seconds. I don't care if Chapman set them up, or any other head ghru they can still be setup wrong for your requirements. If you are getting anyone to set up your valve springs give them all the info about the cam and the rockers you can give. At times I am limited in valve spring set-up becuase of inferior springs.
PS;
You do know that you can increase your EX Valve to piston clearance by changing the way your cam is degreed, don't you?
Ed