[Spanrz (Brett)]

I have the later version of the GSO (Bintel 302). The GSO with the springs is the earlier design. The version with the handles that turn is the later design.
The difference between the 2 is the design of the brake/pivot. WHich they made the turning handles, to better optimise the smoothness of the altitude operation.

Do you have a slider for your pivots? If so, you will need to adjust the slider by a few mm here or there.
I had to play around for an hour or so, to get mine the way I wanted it.

In your case, it sounds like you have it set for a heavy eyepiece. If you have a barlow and a 2" EP, that should balance it.
But it sounds like the pivot needs to be moved a few mm back towards the mirror. So the front end of the tube should be outwards by a few mm.

You can see by the pic, that what is circled is the adjuster for the altitude firmness. Tightening up might help just a bit. You have to comprimise a bit, due to the different weight of EP's. It surprised me that most times I went for the Wide Field EP (2") with barlows, it was very well balanced., take that away put a 1.25" EP in with an adapter ring, and the scope would teeter a bit.
It's all an experiment what works best.

See how you go.