bro, try 1-2g test with 10-15 IU GH for a year and 1-2 g test with no gh....
I am sure you will have added more strength by using gh compared to no using. In the long run gh is a game changer also in the strength game.
15u of pharma HGH is proven to provide definite organ growth and accelerated LVH... that's about it, really. Yes, you will also grow when using at least 2g of test with it, plus other gear. But I haven't read any study that proves HGH alone increases strength and my experience is that it doesnt. In fact, it was never used or proposed for such purpose (strength increases). It is, however, proven to help with recovery, fat burning, healing and generation of new muscle cells.
I agree with you that the effect of 2g test is much more enhanced when combined with HGH, as compared to 2g test alone. However, the difference is from the regenerative and recovery benefits of HGH, also new cell growth. In that regard, and because you recover much faster while on hgh, then yes, you are correct - your strength will increase faster.