I have a huge chunk of lead my my eagle 580. I'm running a saito 56, with a little over a pound in lead to balance it and the thing flies great! Its just the type of airplane it is, long tail moment, gonna require more nose weight. If your running any of the engines you stated, the flying isn't going to be affected at all, just add as much lead as you need until it balances nicely.

Jason</p>