Changing the line-height does resolve the problem.
Here's what I found:
I believe the 'normal' line-height, at least for Arial 14, is 18.
Changing that to 20 produces a text display on the iPad that matches the MacBook Pro,
both running Safari.
So, after changing line-height in Hype, and making necessary adjustments to make the now-taller lines fit in the allotted field size, the text on the iPad looks good.
I hope this also helps others.