OK, while looking for JAM TRIP performers, I've came across his twitter:
https://twitter.com/hhhihamada
Then his official page:
https://lhx10.linkclub.jp:8443/sitep..._page=dom_ctrl
And the confirmation that his alias (real name?) was Kinta Hamada [浜田均太]
Don't look at DrillSpin; again they are lost on this one. I might ask for correction later, but they are quite slow on change (last one took 2 months...)
Anyway, to make things short, he was member of Takeshi Inomata's band "FORCE" [フォース]
And checking credits there you can see his name at that time:
2nd LP obi credits in kanji:
http://darumaya.hustle.ne.jp/img/UPD...102/218349.jpg
Live LP, credits in romaji on vinyl:
http://www.facerecords.com/shop/images/3/3009191.jpg
Well, he even signed Kinta Hamada on this 1st LP but the image is quite small:
http://img03.shop-pro.jp/PA01002/338...20110514185955