You changed the design of the oil system when you added the EDM lifters so now you have to play oil pump engineer to get the system back in balance. Engine builders do this all the time. Pushrod oiling, bushed lifter bores, wide bearing clearances, etc. all change how the oiling system works. The more internal leaks in the engine then the more volume you need to pump. The problem with the HV pump is that sometimes it is too much volume so then you have to use a softer spring to blow off the volume inside the pump.

If you can access the relief spring with the engine in the car then go ahead and run it with the HV pump and see where you are at for oil pressure both hot and cold. If the high pressure is too high then you can change back to the softer spring. I mix and match springs and pumps all the time to get the correct combination for the engine. I use a little fixture to measure the spring force so I know which one to use.