We clip short using a number one also. This is Baja's second summer like this and it seems to work for us, we don't mind him looking like a mini Doberman
so when we got Baja done at the groomers a few weeks ago we asked for Mole to be cut shorter too, although Mole freaked with the noise of the clippers so he just got a scissor cut.
We found he still had too much hair though so we got a set of clippers and got him used to the clippers day by day and have just spent the afternoon clipping him too, so he now has a cool short coat ready for his holiday next week.
It's all down to personal preference I guess, but for us it seems to keep them cool and they dry off quicker which is prefect for when we are on holiday next week at the beach.