No just changing to steel, same pitch, will make little difference to the top end revs, (Except as simmonso says - if anything drop it)
You need to drop to a smaller pitch prop... be it steel or ali. You need an extra 600 revs so in theory you need to drop 3” to a 14". That isn't standard so the choice will probably be a 13" or 15".
That’s the theory, but as has been discussed on another thread... some trial and testing may be necessary!
17” does seem a bit high on a 5.85 with a 90hp…. I had 15” on my 60hp on my 5.85… but that was a twin set-up.