First thing I will say is 'yes' the bike you are practicing on will be hindering you no end! You say Z1 forks, are these the Z1 Drop Offs? If so I used to run these on my downhill bike years ago, no wonder you're aching! You kinda have two options really.. modify your current bike a little (which will ultimately be a waste of money!) or buy something second hand. Basically when you buy a trials bike you aren't simply buying a bike that has rigid forks and no saddle! The geometry is suited to sitting on the back wheel, you mention you cant hold the bike on the back wheel before side hopping, this is partly technique but also a lot to do with the geometry of your bike and the weight of the front end. A proper trials bike won't instantly enable you to back wheel high walls and gap long distances BUT it will allow you to progress faster. You probably could continue how you are and maybe get an extra inch of hight/distance but as you said, it's no fun. What's your budget? Don't bother buying anything new or anything in good condition, just buy something cheap and cheerful that if 6months down the line you stop riding it you won't have lost much money. I seriously wouldn't bother messing about spending money on your bike it will just be a money pit. Oh and as for the sidehop, lean your bike a tiny bit to the left and hang your ass out to the right.. like this Don't worry if you can only hop to the left by the way, most riders are the same!