I play my octaver in first position, too. In second I have a flanger (which you don't have), in third my overdrive (like your do too) and in fourth a wahah.
I would give it a try to place the compressor in first position to get the most out of it. Where to place the DI depends on which sound you want to send to FOH - Some sound engineers hate bass effects and are on the brink to kill you if you have any of these PRE-DI. I personally never cared about that and placed the DI right in front of the Amp input.
Generally, the order of pedals depent on what you want to achieve. For example, most people play the WahWah in first position, I don't like it there. I guess there is no real Wrong or Right, but you have to keep in mind what will happen to your signal. The overdrive behind the flanger in my chain increases the risc of feedbacks, but on the other hand, this is sometimes just what I want
