Welcome to 103 World.

Everything sounds fine and at least yours starts up on a warm start. Most start and die and then start. Much has been written and as you have demonstrated a great deal of time and money can be spent trying to solve the problem.

The stumbling seems to be part of the act until all the systems come on line.

The easy solution, as per your owners manual, give it some accelerator on a warm start to bring it into life.

It soon becomes second nature.

Do a search and check out Norm's comments regarding adjusting the EHA. I would be very interested to know if you see any improvement in adjusting this.

I have contemplated replacing injectors but was interested to note you did not see any improvement.