Bad gas? Bogging/ hesitation

Hey all. Looked through threads and there are so many that I can't find one to suit. I have a K8 1000. Chopped 1" off the pipes looped the 02 sensor back (O2 eliminator) good connection. Took out set valve hardware etc. Bike has run great for a long time. Have not made any recent mods.
Gas light came on today and stopped and filled her up and ever since then she hasn't run right. No power up top, just hesitation. Will hold at 10 grand and not pull any at all. Gets worse the longer I ride. It gets to the point that when I'm cruising at 5 grand in 6th gear I can WOT and it just falls on it's face, no power at all like the ignition has quit, let off the throttle and it comes back. Under moderate to light throttle it seems to run fine but if you romp on it at low or high rpm it hesitates and bogs. I'm inclined to thind "bad gas" but I drained all the gas and didn't find much water in it at all. Gas looks pretty clean. Took out all the spark plugs and they are all uniform, little bit white on the top of the arm that swings out and over and the white part that is suppost to be white is still white, might be just a little but not much tint of red on them. Haven't had the chance to put new gas in it and ride yet but I'm with this feeling as good as the gas looked that it isn't that. Has anyone else had this problem and it been bad gas? Does that sound like bad gas???