I have flown the VK triplane and a Pilot Tiger Moth (and other tail draggers) and both are tippy on landing, but, if you come in under power and not full idle, it makes a big difference. The big prop out front can act like an umbrella and stall you faster sometimes too- I like a 14-6 on the VK kits. I generally come in with a touch of throttle, not enough to stay airborn, but enough to keep the tail under control. I find if you practice at altitude and find the sweet spot, you'll see the plane suddenly take up a nice flaired, decending flight path, and it lands real nice. I usually blip the throttle about the time the tail is going down too- it helps, plus sounds realistic. Like the real thing- learn to wag the rudder.
I used to have an old Robinhood 25 with an FS20 four stroke- nice and underpowered- that I set up with the gear a little too far back, to simulate the issue, and practiced the heck out of it until I could land straight and not nose over. I couldn't even take it off hardly the first several times it ground looped so much- it became a great rudder trainer. But, amazingly, it became very natural to my feel, and I could take off straight and land straight 98% or better. It helped a lot to have the 'don't care' trainer to get trained up on. My Tiger Moth is full-filling that function these days as I prepare to get back into VK- see my photo gallery

vH