It can be frustrating that way, but so far, malipoense overall has been a breeze compared to armeniacum for me.It looks like you hanged them from their buds during development!
This is a frustrating plant to flower most years. Once in a while (like last year) mine gives a wonderful display, but most years something goes funky with the buds, or I get none (like this year!).
While it isn't as long as Maudiae or bulldog hybrids that last easily two three months in bloom, I'm quite happy with 4weeks.Too bad Parvi flowers don't last that long. I still love them and they grow really well in the conditions here.
Yes, a month is actually not bad. I've managed to keep Ho Chi Minh in bloom for 2 weeks, but only under controlled conditions. Any moisture on the flower will finish it much faster. One reason Cypripediums will probably never be truly popular is the short flowering period - at most a couple weeks, three if you're lucky.While it isn't as long as Maudiae or bulldog hybrids that last easily two three months in bloom, I'm quite happy with 4weeks.
Ho Chi Minh has been the only disappointment when it comes to flower longevity. Most I had barely lasted 3-4 days before starting to look tired with one exception where a flower lasted for well over ten days. That plant has not bloomed for two years now.
By the way, do you grow your malipoense outside in the winter in Kyushu?