I have a little seed-grown maxima that I have been growing for a while and I gotta say I am not sure where the reputation as a fast growing plant comes from. The plant is one of my slowest growing and most picky of all the plants I have. I know that there is huge variation among the species so it could be that I just have a very slow growing variety.
Most varieties of N. maxima available grow in intermediate areas with somewhat lower humidity than most nepenthes grow in. However, if your seed grown one happens to come from one of the varieties that has a large peristome, it is liable to be highly demanding when it comes to humidity, since those varieties grow in more humid environments.
Furthermore, if you grow this plant in the same conditions as obligate highlanders, when maxima grows at a range from 400 m to 2600 m, you may have ended up with one of the varieties that grows at far lower altitudes, and thus the plant might be colder than it likes. It would be cool to end up with a variety like this though File:Nepenthes maxima Anggi4.jpg - Wikipedia
You know, I think mine only makes one pitcher at a time too. I just assumed it was my crummy low-humidity conditions so I feel a little vindicated
Pretty sure that's not typical for any maxima variant (at best, might be a hybrid). Overall, N. maxima as a whole are not picky plants (even forms with large peristomes which is partly age and environmentally controlled, and those can come from a lot of locations so it is probably not a factor in humidity tolerance; large and small peristome plants can come from the same population even) and few forms are actually considered truly highland, most like warmer intermediate conditions anyway. If my experience is anything to go by they are not fast plants though; my seed-grown forms are rather nonchalant in growth rate, and BE-3067 is steady, but also not quick. A new leaf may form every month, month and a half at best usually.
photobucket sucks
Very nice plants, especially the barcelonae! Another one I'll need to track down, it's a very cool species.
Also, just curious, what temperature range does your attenboroughii get? Mine seem to have their ups and downs and try as I might, I can't seem to figure out what they want