One thing to note - there isn't a "normal" difference between low beam and high beam . It is only a slight increase in height and this is probably due to the IPF's cutoff in the housing's lens . I would expect some of the other housings out there to react differently .
Glad to hear you pointing this out. It's not due to the design of the housings. It's because with a halogen bulb the high beam filament is actually in a different location than the low beam filament. With the LED it just gets brighter, but doesn't change the shape of the beam.
This is the key drawback of these LEDs, IMO.