I went through all this 3 years ago, Actually I never thought about adding or paralleling resistance to the NTCs, I was just happy to have the A/C back. Anyways, I am not going to do anything now as I will sell the car in the next couple of months, It is too big for parking here in view of local changes that have been made.
Thanks for the suggestions which I would have tried when I had the A/C problem.
M