Good advice from Auger.
Make your approach slow and shallow enough.
In a Spit, touchdown speed should be around 90 mph, descent rate under 1000 feet per minute (thats between 0 and -1 on the climb indicator). Also, have your flaps down on landing.
On final, use the pitch (elevator) to control speed - nose higher to slow, nose more level to speed up. And use the throttle to control your descent rate.
A good practice for that is flying half an inch over the runway at stall speed a few times, before actually lowering the gear to land.
Just before your wheels touch the ground, flare by adding a little bit of throttle. Always keep your nose high on landing - if you aim for the runway, you are going to hit it, hard.
As soon as your down, chop throttle, lock tailwheel and just let the plane roll a bit before starting to brake the wheels.
If you keep having trouble with the Spit, try a P38, then HurriMk2, then FM2.... they easiest to land. Once you get them down safely, retry the Spit. (of all the spits, the Mk14 and Mk16 are hardest to land).