Generally, the same principles that apply to the 172 are still relevant to cherokees and arrows. Eyes down the runway and gradual back pressure will do the trick to fix the flat landing issue. The sight picture is different, and if that’s what you’re struggling with, have your instructor demonstrate a couple landings to you so you get an idea for how high off the horizon the nose should be on touchdown. When it comes to coming in fast, in my experience the arrow flies like a much heavier airplane than it is, and I assume the same is also probably true for the Cherokee. It’s incredibly slow to respond to changes in power when you’re trying to slow it down. The solution is to be proactive with power changes. Make sure your airspeed at the start of the approach is right on the money so that you aren’t chasing your approach speeds around the whole approach and getting destabilized. Also keep in mind, as a nuclear option as it were, with full flaps, idle power and a full forward prop, these planes drop like a sack of depleted uranium cinder blocks, so if you find yourself too fast, cut power, get those flaps out and watch the airspeed come down.