Oil consumption, smoking, new pistons?

[jyrki]

Hi,
my FJ1200 1988 is using quite a lot oil, let's say 1l/1000 km. On track friends are saying that it smokes when breaking with engine. Smoking/oil consumption even thought I have:
- I have changed new pistonrings
- valve stem sealings are new
-cylinders are "honed" when I changed new piston rings

Guestions:
-what type of new oversize pistons you recommendate to choose? maybe some more power with piston selection?

br Jyrki