Rulk was officially depowered and we go by current versions after his downgrade he only had low showings...
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Rulk also has a very decent healing factor, and besides the victories he took home that everyone knows about, he should be able to beat Wonder Woman senseless. After all Mongul Jr. was able to floor her with one punch during the most recent Crisis. Rulk imo is above Mongul Jr.
No way, not unless you're underrating her by quite a bit.
I haven't read FC yet so I can't comment on that scene and don't know it's circumstances (what do you mean by 'floored'? Knocked downed? KOed?), but are you aware she's also thrown down with no-holding-back-strength Superman, who would beat the heck out of Rulk? Heck, she even beat magic strength-Amped rampaging mindless Superman. Thrown down with Doomsday for a bit (though didn't win that one, of course). Matched strength with Captain Marvel. Helped move the moon. She's got tons of great showings too.
Any long running characters has good and bad showings, but her regular level is very high, her blunt-impact durability is generally similar to Superman's, her hand to hand skill is well about Rulk's, and she's got a buncha magic gear that gives both offense and defensive edges.
The tiara alone should allow her to slice and dice him, he's shown abysmal resistance to cutting. Let her use her axe or sword and we're talking stompville.
Keep it purely fists and lasso and while it's not a stomp, she's got speed, skill, and defense (bracers) over him, and top tier strength, so she still has an edge overall.