i'll add a preface to my post that my opinions may sound a bit controversial to some popular notions about arrows and bows. these are all my results as they apply to me, after spending far too much time and money on arras, and not enuf time HUNTING.
i've found that carbons are far more forgiving when it comes to weak *static* spine than ya might imagine. the *dynamic* spine is what matters most, and a spine meter ain't gonna show ya that data.
you shooting outta yer bow is where the rubber meets the road for carbon arras. the arrow flight equation includes not only yer bow and arrow setup, but also to a very large degree how you shoot - an extremely important factor for any accurate shooting. if yer form is off, if you short draw, if yer not aiming the arra, if you pluck the string, if you drastically drop the bow arm, etc etc - you are probably not getting the correct arra flight results you should be getting. think about that.
my main carbons are beman ics 500's, which equate to 35/55's. i use that same shaft for 40# thru 55# bows ... all at the same 29" arrow length. for the 55# bow my beman 500 arrows are 585 grains - that's 350 grains up front - and they fly like darts with or without feather guidance.
i build my hunting arras at 10gpp minimum, so that'd mean a 470gr arra for a 47# holding weight bow.
so, i'd suggest to simply up the front end weight from 145gr to at least 200gr (or more). one neat benefit is greatly increased foc, which will add that dart-like performance for flight ... and penetration.
shoot heavy, 10gpp minimum arras for hunting - yer bow will thank you and yer quarry will not. :D