I kind of forget how to program this machine. Anyway, G143 is tool nose comp and is need to be on top of every program your are running and you don't need to cancel it the machine turn off and on on every tool change.... that's why I love these control. However if you are rerun the same tool twice the comp is not yet cancel it might act funny(most time it will be ok) i think that's what happen to the radius(G140 to cancel it by the way). As you mention T0808 or whatever the tool is, it is'nt needed only needed Txx00.