RE: Changes?
Dart,
If its working for you, great! Make sure you richen that needle up when going up 20% of nitro, you don't want to damage the engine. Other than that, you should not be doing any damage to the engine as long as it is kept rich. I feel that 30% may be a little over what ASP recommends and the engine may not have low enough compression to effectively utilize that much nitro.
You went straight from 10 to 30, you may find that you would have been perfectly satisfied with 15 or 20% nitro and save the high cost of 30.
I see no need to add oil to any commercial helicopter fuel.
Hope this helps.