The only thing about plastic spinners and electric starters is that the starter can mar the spinner. If you're careful and don't jam the starter on the spinner - especially when the engine is hydro-locked or even severely flooded, then you can melt rings in the spinner.

But all the spinners I've used (about everything available) has worked fine.

BTW - Dubro spinner nuts are light. They won't help correct a tail-heavy condition. A regular spinner is a lot heavier than the dubro nuts. If you need nose weight, then the Higgley Heavy Hub and a snap on plastic spinner (if it will fit over the nut) is the way to go.