YamahaRichey, I run my bike at Moab and Colorado rockies as well. I have run a 48 pilot as high as 10,800. feet. It is really rich (way too rich). I recommend the stock 45 pilot for above 8000 feet. In Moab at 5000 feet I like to run the 48 pilot. I have had the power now on for over a year. I think it really helps the bottom end throttle response.
I am on the 45 pilot right now getting ready for Colorado in June and I have noticed a little less grunt down low just off idle at my elevation of 700 feet. I really notice the 48 pilot pulling wheelies easier over stumps and logs without the clutch. I am going to put the 48 pilot back in after my Colorado trip. I think the thing to note is that the pilot circuit really plays a big role in low rpm off idle throttle response. I know the 48 pilot runs rich but I have never fouled a plug. My current jetting is listed below in my signature