I agree with Divina - there have been hundreds of Rx proved and if I am correct you just restrict yourself to the ones from Boenninghausen's Rep. In this day and age I feel this is quite restrictive but as I always say - I use what works for me and my patients as you obviously do for yours.
Re Carc. you are correct in saying that there are many forms of this. I personally often prescribe the one from Ainsworth , which is a mix of 15 nosodes and is as prescribed by Tinus Smit. Please see his website for an excellent description of this Rx. If I am prescribing via Dr Ranamkrishan's protocol I will use the single nosode of Carc. from Helios. I have had wonderful success with this Rx when the symptoms match.

Nuela Eising from Ireland proves Rx and I have used her version of Mobile Phone which cured a patient of his headaches he got everytime he used his!!

Would you also never consider using the remedies proved so carefully by Jeremy Sherr?

I think you are a great homeoapth Hans with very sound principles but your prescribing technique is not the only one that works. The important things are 1 remedy, minimum dose , prescribed according to the totallity of the presenting symptoms at that time.

I go to as many conferences as I can to keep up with the new provings and attempt to understand the many new prescibing techniques including ways of finding the remedy as in Sankaran's levels, his Plant Animal and mineral differentiation, Scholten's Elements etc . I use what I can get my head around and what seems to work for me towards making my patients healthier and happier.