In my experience, if you don't use at least one bag smaller than 73 you're tossing away quite a bit of good stuff.
A 25 will catch a little bit more good stuff that falls through a 45, but not all that much, and it also takes forever and a day for the water to drain through a 25. Since yield is low and effort is high, lots of people don't bother with a 25. IMO, if you've already got a 25, want to capture every last possible bit of hash, and you're not in a rush, you might as well use it.
In general, the first bag catches most of the leafy junk and other contaminants. Most use 220, but 190 could work fine for this too.
After that, how many bags you use and which ones is up to you. Note that ultimately it doesn't much matter which ones you use, you'll end up catching the same stuff, just in different bags.
In general, more bags = more grades, but also more time and work since you have to rinse each bag, spoon out the hash, dry/process the hash, and clean/dry the bags. Also since some small amount of hash will stick to bags, etc, the more bags, the less efficient the process, though in practice this isn't a factor unless you're processing fairly small amounts of material. The less stuff you're running, the less it pays to try and separate the hash into many different grades. You can also inspect what comes out of each bag with a loupe to get some sense of what you're getting and whether or not its worth it for your particular mix on the next run.
As a fairly simple but efficient method, I suggest 220-160-73-45.
You can substitute 190 for 220, and 145 or 120 for 160, depending on what you've got, and the trichrome head size associated with your particular strain(s).
Depending on how much stuff you're processing, how much you're after the "full melt" type of hash, how badly you want to capture every last grain of kief vs. time/effort, and which bags you have handy, you can also alter the smallest bags, either substituting a 25 for the 45 or adding a 25 to 73 and 45. IMO 25 takes so long to drain its worth it to put a 45 in there first.
If you just want "a" lump of hash, and don't care about full melt or grades, you could probably even do just 190-45 and be done with it, though you won't end up with a particularly high grade of hash, and it will take a while for the water to filter through the 45 with lots of stuff in there.
