Or PM me, I have a bunch of tonkin... could send 10-20 or so spine and weight matched, but not soon. Maybe late December. unless you don't want them matched..
Or contact Jaap Koppedrayer, he sells Pseudosasa Japonica/yadake from his bamboo farm, which is lighter. But the ones I got were rather weight inconsistent by over 100 grains.. could ask him to match by weight, or even heat straighten, but it would cost more?