This is just one of those things where it's difficult to give any helpful advice without being there and seeing what's going on in person.
Having a Ser. II diesel myself, all I can tell you is it just may be a matter of trial and error, then try try again. I've had times when it took me 3 or 4 tries to get a leak stopped after changing the oil filter. The fuel filters aren't much more forgiving either; that's why you see so many of the early diesels converted to all spin-on, or even clip-on types.
I know that canister housing has to come down just so and lay about perfect on top the flat gasket in the base. The base opening is bigger by a good bit more than the canister itself. Try to get it in the base as evenly as possible all way round. All it takes is to be off a little to encourage a leak.
Try not to spin the canister down into the base either, that might move or crimp the flat gasket. I know its a pain because it's bolt is spring loaded; but try to hold the canister all the way down into the base, again, as evenly as possible, then slowly tighten the bolt down with your other hand, just enough so it holds the canister down so you can release your other hand. Double check how it looks sitting in the base on top the gasket. If all looks well and even - Then go get a good crescent wrench and finish tightening up the bolt, while holding on to the canister real good. Again, don't let it spin on the base.
So, that's how I've always had to do it, and some years it still took me a few tries....after walking away from it for a few hours!
If persistence doesn't pay off, you may want to take that canister back off and set it on the the most flat, smoothest surface you can think of and make sure it doesn't looked damaged or out of shape in any way.
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