Thats awesome Mike! Yes, you are going to love them, especially the longer you gig with them, you will find they work. You got some used you say? That awesome brother.
Steel is harder than bronze so it will damage the cymbal. In the old days there was damage to cymbals, so your argument is invalid. Bottom line cymbal companies recommend felt washers AND plastic sleeves. If you don't do what cymbal companies with all their experience recommends you're being wilfully ignorant.