2016's spine out at 61lbs
2018's spine out at 69lbs

I would opt out for a stiffer spine shaft also.

Here is a list of spines as they go up from the 2018's

2217 - 70
2020 - 74
2215 - 76
2117 - 78
2216 - 84
2315 - 91
2219 - 94

I would think the 2219's to be to heavy something between the 2217 and the 2117.

next I would be worried more about arrow flight then anything else. No where else in the scheme of penetration will you loose more then poor arrow flight with the next being broadhead angles and sharpeness along with the amount of blades and diameter. You'll be fine in all regards if you can get an arrow flying perfectly even for animals up to and including Ak moose and grizzlies. Arrow speeds themselves are also irrelative! A bowyer might need to atleastthink about some of these things "efficency", but the shooter shouldnt worry as much in figures as he should in with results!

Next find a head you like. If it's 125 grainers so be it, but dont switch unless you absolutely can't get it to fly (usually there is a problem somewhere you are overlooking). Some guys like heavy heads, some dont. I dont like light heads, but extremely heavy heads messing with to many other factors of arrow flight, not to mention adds little to the overall weight of a shaft. Again the most important thing you can do is find a combination to fly, whatever that maybe dont worry about the figures. There is however some fudge room here. THere are shafts as you can see that spine out reasonably close to other shafts however weigh considerably different. The heavier side arrows will help nock some of that noise down. As will getting rid of the rubber silencers and placing them at the 1/3rd or 1/4 intervals (similar concept as guitars dealing with harmonics, afterall that is where a bow started so some say). Measure this from where the string lifts from the limbs, not the string grooves itself. Some guys will place one at each and might not be a bad idea with the cat wiskers, even more so if you trim them to small balls. I would be a thinner diameter string itself will also be quieter as it will help in the recovery of the limbs. Eight plus inches on your brace seems high but that is just my opinion, again these numbers are only references, they are what they are and dont change them on speculation just because I think this or he thinks that, or he says it should be this or that way.

Stickbows have changed little over time imho. The concept is the same though materials and designs have changed, speeds have changed little compared to the wheel bow sides. Strings will help performance along with other idears that I don't care to mention for fear of a flogging by the heavy arrow guys.... [&:] Again it is what it is and dont worry about it. Now if you were going to be hunting cape buffalo then every spittin thing may help, or you were hunting elk with a 40lb bow, then ya I could see it. Get the arrow flying right, put it where it needs to be with a quality head that's EXTREMELY sharp and enjoy those steaks.