Hey there!!!
Lets see if I can help!
How much mini's bloom depend upon several factors, but basically boils down to their ancestry and care basics through the year. Some may have more blooms than others based upon what is in their gene's, but usually it is just a matter of how well they were care for in the past year (adequate light, feeding, cooling time, etc...) that determines the spike ability.
Phals shed their bottom leaves through time as they produce new ones from the top. If your roots are ok, then I wouldn't personally worry about the bottom leaves. It is natural.
Care for them just as you would any Phal, standard sized or mini. Sounds like you've got it right from what you wrote! Congrats!
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