The whistles you have (although I don't know what you mean by 'steel whistles') should all be able to produce the high notes you're looking for without a problem.

Buy your average Generation or Feadóg, they take a bit less air and are not as loud (especially in the high octave) as the ones you have.

Solution, without trying to sound harsh or glib, learn to play well and learn to control your breath to hit all the notes you want. Practice, in other words.