What could be the reason behind it, can it really feel better than penetration or is it something in his head?

I gave many handjobs before but never really focused on it to be the best. Now since my partner is crazy about them, I would like to put some effort and make it amazing for him. Do you have any specific advices or techniques which can really make a memorable handjob?

The second problem is that most of my guys before were circumcised and my partner isn’t so I don’t really have experience playing with that extra skin. How do you do it with uncircumcised guys and what should I pay attention to? He has a very tight foreskin and I could easily pull it down when soft but can’t really move it much when hard. I explored it lately and managed to pull it down when hard but with a lot of lube and going really slowly, it took me 10 mins just to pull it down without hurting him. Should I just continue giving him handjobs with skin up, is it still pleasurable enough or I should always work that skin down? Also once it is down his head is really sensitive so I’m not sure how to play with it. Any advice from someone with uncircumcised guys experience will be helpful.