Most of my experience is with Carbon Express Terminator Hunter 60/75's and various weighting methods. In my arrows, out of my right handed Morrison takedown, arrows that impact on target without the yellow 3gr/in will impact approx 2" to the left with the tubes. Don't know about defying the laws of physics but I can get these results every single time all day long. No other changes in the setup, just adding weight tubes. Not sure what would cause that other than too stiff. Can't say about the other commercial wt tubes cause these are the only ones I've bought.
As far as aquarium tubing, maybe you are thinking of the rigid airline tubing? I'm talking about the really soft clear stuff...you can easily tie it in a knot if you want to. It's fairly heavy because of the thickness of the plastic, but very flexible.
I wish I could get the tapered shafts to fly out of my bows. I have never been able to get the AD's to NOT wobble, no matter how much tuning I tried...same for the Grizzly sticks, I went from way too weak to way too stiff with exact same flight results. It certainly may be something I'm doing, but I can't get them to perform nearly as well as tubular shafts.
They certainly work for Terry, I've seen him shoot them out of bows with 10-15# draw difference and fly perfectly. I put them on my bow and they wobble like crazy. I know it's just me, but it still happens
NJ, David says we'll get to my target wt of 63@27. My hope is, it will be enough to push the CT Safari's (15gpi) I've been playing with. I'm not 100% sure but I think these spine at .150 or so, vs. my typical CE Terminators of .290. I'm looking at about an 800gr finished arrow, with hopes of shooting it off the shelf. I'll let you know when it gets here how that works. What are your suggestions for arrows, always open to something new?