Phal: excessive blooms and bloom duration questions

[Nali12]

Some of my orchids have decided to bloom this spring, much to my delight, but one thing keeps worrying me - some of them seem to be set to grow too many flowers, sending multiple flowering spikes that branch off into numerous more spikes and so many flowers that I don't feel like the plant could sustain them all. The orchids seem to agree with me, and sometimes the first, second, or third flower buds seems to wilt and fall off without ever opening. The blooms also don't seem to last long. When I bought my first orchids from the nursery, some of them held their flowers for up to 8 months (it was amazing!). Blooming second and third time in my care now, they don't seem to hold their flowers long, sometimes first flower will wilt and fall off before the rest of them open up (in other words, the flower buds bloom like an estafette one after another).

My questions are:
1) How do I encourage the orchids to bloom with one strong flower spike, instead of spreading their strengths thin growing branched spikes?
2) How do I make the bloom last and hang on there, instead of blooming as a cascade, one bud opening up as the next one is already wilting?

The orchids in the photos are standing next to a window that gets bright scattered light for about 5-6 hours a day. Watered every three to four weeks with a diluted 20-14-13 fertilizer per instructions on the box. The first, larger orchid is trying to grow 40+ flowers. The little orchid w/ white-pink flowers is in process of blooming, but two flowers are already wilting as the rest of the buds haven't yet opened up.

[WhiteRabbit]

How do the roots look?
You water every 3-4 weeks???
Have you repotted them? What type of potting media are they in?

[Optimist]

Maybe less fertilizer?

[Mocres]

I' ve got one phal just like yours, and it has even more branches full of buds. I think this is a characteristic of this hybrid.

[PaphMadMan]

If the only water is every 3-4 weeks I think I see the problem - drought. Even in mud they probably need water more often than that. Along with too much fertilizer - cut back to 1/4 strength once a month.

What is the temperature and humidity in the area?
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Additional comment:

Those spikes look quite sturdy, and the branching and flowering pattern is quite typical for this type of Phal - indication of an abundantly healthy plant. If the flowers aren't lasting - not enough water, high heat, low humidity, infestation.

[Ray]

Most folks would give their eye teeth to have plants with multiple spikes and lots of blooms, and you're concerned about it??? It's a sign of a good, healthy plant.

I agree with the others that the plant is not getting enough water.