Sounds like you have this figured out, but I'll just reinforce what you've posted-

O'Neill's Music of Ireland heads the section of 9/8 tuns as "Slip Jigs and Hop Jigs". Most musicians I know don't distinguish between the two, but for those who do, the rhythm of the 9/8 time "hop jig" (humpty-dumpty-dumpty) is more like a single jig (humpty-dumpty). A "slip jig" would be more like humpity-dumpity-dumpity. The Butterfly or The Snowy Path are common 9/8 tunes that fits the musicians "hop jig".