Ok, i'm clearly not getting this

It seems i need to be using 3d Adaptive paths, these have rest machining as well.
Tried that and as the tools get smaller it adds an ever increasing workload of finer and finer paths where it tries to perfect the previous path, this adds hours to the time so is pointless.
Trawl the 'tube and mr NYCNC had it but "fixed" it by making stock-to-leave+tolerance bigger on each tool - this may work for two tools but i have 4 and by the time it gets to T4 i am leaving 0.43mm of stock - this means too much for a cleanup pass with the 1.5mm tool at the end.
Baffled now, i did not think this would be so advanced.