Rajah, many thanks for your comments. In fact not all of my plants do look too happy right now. They are back on track after fighting a very bad mite infestion on some of them. Beeing too small to see those mite even with a magnifying glass, it took some time before knowing what the problem was. I plan to put up pictures on my site, when I've finally won.
N. macrophylla grows much easier for me than N. rajah under similar conditions. It likes very high lightlevels but that is not unusal for highland Nepenthes. N. rajah in contrary is more happy with much less light - according to my experience.