First of all, that Paph philippinense x squirolei is one beautiful specimen plant. Marvelously well grown.
Secondly, after reading about esquirolei, since I know next to nothing about that one, apparently it wants the same light as the philippinese and that one wants Cattleya light levels to flower, so more light.
Also, both philippinense and esquirolei are calcaerous, so it won't dislike some lime supplement (note, not all Paphs like lime in their substrate, venustum would be one of them). On the other hand, you've had it for 7 years, and it has grown into such a large plant. I don't really know if you should change
anything, beside the light levels. It quite clearly are getting what it needs, as I can't see any sign of deficiency. Try increasing the light first, do it gradually so you don't burn it.
If that doesn't work, try that temperature drop, as I can see the esquirolei experiences down to around 12ºC (~53ºF) in its natural habitat. Philippinense is a warm grower, so it's up to which genes are dominant in the hybrid I guess.
You can read about all your Paphs and the parents to your hybrid here:
slipperorchids.info. This is a great site, and it'll tell you a bit about what kind of conditions they might prefer.
Flowering with 2 fans each is not a problem (and spicerianum is a small species). If the Paph in question only has one, you should cut the spike, either before it develops the spike too much, or right after it has opened the flower if you want to see what it looks like. This to ensure it doesn't stress the plant too much (apparently staying in bloom takes energy from the plant, not only developing the flower, or maybe this is what we keep saying to ourselves after we let a one growth Paph flower before cutting the spike
).
Why your venustum and spicerianum both died after flowering, I don't know and I wish I could help. My guess is that what the others have said, is most likely the cause.
Good luck with you monster plant and let us know what happens!
Oh, and you can make emoticons with 'quick reply', too if you know the code for it, for example this one:
is written like : scratchhead :, but without any space between the colons and the word.