Just my experience (and 2 cent).
I moved from recreational OW configuration, as taught by most of the agencies, to long hose, and backup on necklace.
Because I'm very tall, there is no option I can go with 5ft long hose, so I use a full 7ft. Moreover I put a pocket on my right side (no canister light till now) and I route the long hose on the pocket as people do with the canister.
I also noticed that the best routing starts from the first stage, either if you dive octopus or with two first stages and an H valve on the single tank.
Depending on which 1st stage you have, you may try to experiment the different port choices and also significantly different orientation of the first stage on the valve. For common first stages form factor (and brands also) Google can find for you may pictures for routing, just observe and try them on your rig.
I also changed inflator hose lenght, because I did't like the curve it did behind my head.
Look also to the SPG and its HP hose, to be more streamlined, often you need to shorten it: recreational lenghts are too much even for me.
I think that Hogarthian routing is a very good option for it. In case you shoud have an AI computer, probably you don not look at the SPG during the dive to check remaining gas, so a shorter hose is not an issue (should not be in any case, but someone prefer to look at it without unclipping).