alot of jayce player normally want to bully or kill the top laner by using all their ability to do the job.Ths a bad idea because as you use more ability you run out of mana and when your mana runs out this gives the enemy champion to strake at any time. this can be bad for you if you go agaisnt tank (like ornn,lloai,trydamere etc.) which health want drop as slowly as other champion when you attack making it difficulty for you when you run out of mana;you could use teleport but that is a worse of time which you could use farming.So i have discovered a way to deal with this by using only range and not really focusing on enemy champion.I use my hammer form as a finishing move, push back enemy or to get mana and i dont forcus all my enegry on enemy champion but if you want use your Q and W when their is a opening.You see the hammer form is not supposed be a second ability its acts like an some way ultimate where it can be live on as long you want.Some people might have different ways to use his hammer and range but i think this can get you more wins in
top lane for me. this really my opion at top lane not mid or anoother lane