When I switched from B50 to FF on a longbow years back I had to shorten my arrows about 1",but those were wood arrows.But carbons are a different ballgame,your bow is a recurve and is it cut past center? The only way I know for sure would be to strip one bare and shoot it,to see how it flys.You may be able to lighten the point weight alittle also.It doesn't take much shortening to stiffen up a carbon in my experience.Carbons react differently and reciver quicker,they may be fine or you might need to shorten alittle,but I would shoot them before I would do any cutting.