Go to some carbon arrow manufacturers' websites and see what they have. You're missing something. There are actually carbon arrows made that can be beavier than aluminum. Py attention to spine first. You should have something with at least a 300 spine. After that look at grain/inch of the different shafts. Multiply gr/in times the length of the shaft. Add the weight of the insert, tip, fletching, nock, wraps if you will use them. This gives you total arrow weight. For 74# you need at least 370 grains.

Looking at the different shafts made you should have little problem getting something as heavy as 500 grains if you so wish. Whoa, I just saw the CT Safari shaft (70-95)---how's 15.5 gr/in sound?
29" shaft coms to 450 grains. Add 15 for insert, 30 for vanes, 10 for a wrap, 125 for a point., 12 for a nock. How does 642 grains sound for a heavy arrow.

Gold Tip 22 series is 7.3 gr/in. Gold Tip Big Game is 10.6/in. CT Hippo is 11.1/in. With all these options you can make an arrow anywhere from about 325gr to 640 grains. And these are all carbons. You just ain't lookin in the right places.