YG I wouldn't bother changing your injectors over if they are running OK. There has been no posted dyno results showing any boost or benefit from the use of the 4 hole injectors. I experienced a boost in performance by cleaning my OEM original 170,000 K injectors and getting the correct spray pattern. The reported seat of pants benefit reported by riders switching to the 4 hole injectors is because they are now running with clean injectors. If they had cleaned their OEM ones the same seat of pants benefit would have been felt. You need to get hold of a dial gauge indicator. Remove your calipers and cobble up a mount so you can run the gauge on a smooth track on the outer edge of the discs. The runout needs to be less than .200 mm or .008 ". Minor excess of this figure can be corrected. If the bike has been left sitting for long periods the discs will also benefit from a good cleaning. While cleaning check the surface of the discs for and abnormalities. Also check your pads and give them a scuff up. I carry a spare clutch cable and lever, throttle cable, my old OEM fuel pump with a foot of line and clips, self sealing silicone tape, insulation tape, front brake lever, 3 spark plugs, tools, small can of WD40,first aid kit, tyre repair kit, ,a compact bicycle pump and a part roll of toilet paper. And heaps more that I should pull out and photograph so i don't have to try and remember what's in there.
Regards Martin.