inflorescence dieback on Ascocentrum ampullaceum

[Maxx]

About one month ago I acquired several Ascocentrum (Vanda) species, from which now my Ampullaceum is about to bloom, however the inflorescence shows some dieback for some reason (this was also the case previously with my Garayi).

Any ideas what causes it, and how can I avoid it to affect also the other 4-5 inflorescences currently evolving?

Is it the daily misting (or the regular soaking in 20-20-20 fertilizer at 1/3 strength)? Otherwise the plant seems happy, the roots are starting to branch like hell, and also a new basal offshoot is showing.

My growing conditions: western facing window, temp 75 F, humidity 60%, watering is daily with 5 min soaking in 20-20-20 fertilizer at 1/3 strength / or misting.

Picures with a bonus garayi pic

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