Mikey - it's very difficult to say "How can I get my car to handle as a good as X" because...their suspension setups are vastly different and they will always handle differently. I don't think many people at all on this forum have a concept of what "Good handling" entails, but rather think a very grippy chassis is all this is requisite of "good handling".
That being said, the EP chassis is very light (which would give it an upper hand in terms of agility with regards to the EK9), and throw a lot of various modifications at it and get it professionally aligned, and sure, you will get a well handling EP, that is far grippier than standard (Tyres are very important), but perhaps not really suited to country road driving - despite the opinions of some, the Beam Rear Axle, will ALWAYS be a hindrance on a bumpy road. Maybe not to an extent to where it can't be driven fast, but an IRS equipped car, with the same level of modification (and for sake of comparison, same weight), will always be able to travel faster on a bumpy road without undo unsophistication from the rear axle.
All the netsperts will tell you to do the same thing - Anti-lift kit, ARB's, Coilovers, Adjustable Panhard Rod etc...and to be honest, that'll be more than you need. But you cannot compare (accurately) the distinct handling capabilities of a Double Wishbone/Independant Rear Suspension (I think also Double wishbone) sprung car, with a MacPherson Strut/Trailing Arm Beam Rear Axle car. Without going too indepth, think of it this way - Unsprung weight at rear of EK9 comprises of the wishbones, shocks, brakes, wheels, hubs. On the EP you've got the shocks, brakes, wheels, hubs....and a whopping huge axle too. Which is going to react quicker, maintaing traction with the road surface longer, react with a bump at individual wheels better...
But anyway, you can get the EP to a very high standard, perhaps one that could even surpass the EK9 in terms of grip, but I think the EP Chassis is just not known to be able to do with mundane settings, what manufacturers can do with far better settings to start with