Graham Phantom Supreme 12" - heavier counterweight needed ?!

Hello to the community,
as a newbie I would kindly ask you for help in this matter (I'm a long time reader of your advices and helpful recommendations but never launched an own topic!)

Athough the supplied standard counterweight is said to be good for cartridge weights between 5-19g it seems that with a 9g Koetsu cartridge the standard weight is not heavy enough to receive a proper balance or VTF.
I have seen a posting by Bob Graham in a German forum (just a screenshot) where he says he supplies 2 weights with his 12" arms, 35 plus 70gs, but this was never true for Austria, where I come from!

My 3 questions to you are:
1) can you imagine what could be the reason for that the standard counterweight cannot balance a 9g cartridge? (a potential set-up failure?)
2) it seems that I have a wrong mail adress of Bob Graham - can you supply a current one?
3) where from/ how can I get the heavier counterweight for the 12" Supreme arm?

Thanks very much in advance for your help and assistance in this matter!

Kind regards,
Carlo