I still really don't know exactly what you want, but i'll try:

You can move single samples more freely on the grid, i.e. a lil later/earlier by going to a) 'Channel Settings' of your sample -->FUNC---> Time---> Move the Button labeled 'QFS'; this will alow you to move a sample between the 16ths (for example to 32 and so on)


You could alternatively try Propellerheads 'Recycle' and cut your loop into small samples and the move them around in the step sequencer with method a) (above) or within the piano roll where you can set sample lenghts and so on very accurately.

Any help?