10in is ridiculous. Could have warned you about that. You'd have to be stinkin' tall to appreciate that. And before answering your question, I have to ask: What does "safe" mean? Safe to run? Safe investment? Etc. I can see that this is an older sled, and anything taller than factory bar settings in going to be uncomfortable while sitting. Just up to how tall you are, how often you stand vs sit, and how often you ride in places where you need the bars to respond quickly. You will note several posts on here where the owners of new Pro RMKs are actually going lower with their bars for faster reaction time in the trees....
So, depending on what you were after in the first place, the answer to your question changes...