yes, u r very lucky, u will not have problems unless ur eng overheats. also the lack of back pressure make the eng very uneven when flying vertical compare to horizontal, i mean if u enter a loop at full throttle and u hear ur eng leaning out when vertical, it means it could use more back pressure.

i also take the buffle out of some of my eng for planes that are not 3d, but if u can hover indefinite time the way ur eng is, then just leave it the way it is, but ameya is having problems and his eng quits when vertical, the 1st thing i recomend him to do is to put the buffle back on if he had removed it.

ps: i dont know why in my 15 years of rc plane expirience, since ive become a very good 3d pilot, most people come to me to ask me for help to tune their engs they dont believe the buffle helps with back pressure until they have problems and they put it back on.