Thanks for the reply. I already have two German knives and I sharpen them on whetstone. I have a 1k-2k-5k set from shapton. So shirogami will be much better anyway than my 55-56 hrc knives.In your situation, I would first abandon pinch grip completely as it is horrible. I was taught to use it but quckly went to propr grip (full hand over the handle) on my own. Thre are many reasons for that. Also, Yo (Western) handle will give you adidtional support. Grip the handle and you will have perfect control. Just do not admit that to any of the experts.
If this is your first and only Japanese knife, Shirogami is not a good choice plus it has bad edge retention. I would recommand starting with a sturdy 15 dps VG-10 knife with Yo handle. I just peeked at my favourite EU shop and excellent VG10 Gyuto Tsuchime Suminagashi I have and would recomand costs 121€.
You will need a sharpening solution, too. Any knife will get dull and then it is dangerous.