If you aren't overheating it on the ground, it will not hurt to have more run time, if you want to do that.
I think craigteffe and others are doing the same as I am, and that is assuming that **usually** folks really DO overheat new engines on ground runs, and we're cautioning to prevent that from happening to you.

If you are managing the heat appropriately, not making high throttle more than short spurts.... you probably will NOT harm the engine.

It's just that I think we've all seen folks who mean well accidentally overheat and sometimes ruin a nearly new engine because they want to see how much guts it has on the ground.

Sounds like you are being careful and watching things; my .02 about that is that you should go ahead and press on with it like you're doing. Just be careful to NOT let it get hot, you should be good to go.

Others may have different opinions..... there are lots of ways to make these things work for us.