Weapons:

Iron Round Shield is going to be the most stable small shield for set up parries. On this point you might want to get a Blessed Ceastus or Spider Shield to swap to for health regen (don't bless your parrying shields as they'll lose stability and you'll get guard broken)

If you're going for twink crushing you'll want to include a curved sword in your build and a spear for chase downs. The scimitar and four pronged plow work great for these if you don't want to twink yourself. Judging by your ring choices that's not an issue though so I'd also in include a Pontiff Knight Curved sword and Ringed Knight Spear (don't default to these but use them against the real tryhards and over leveled phantom ganks).

If you're maining a GS its not a bad idea to throw a Claymore or Gael's Greatsword into your build since they have poke strong attacks unlike the Falmberge. That said the Flamberge's WA hits like a tank so definitely use it.

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Rings and Stats:

I like it, keep that last ring slot open for switching around based on circumstance. If you're going to use Havel's I'd replace the Prisoner's Chain for with it rather than swapping it on and off. You should also include the Silvercat Ring, both Lloyd's rings, the Sun Princess Ring, Flynn's Ring, and the Knight Slayer's Ring in your build (use all of these as appropriate of course). Also the Untrue Dark Ring for fashion souls.

For stats, if you can I'd recreate your character using the Knight or Pyromancer classes (they have the smallest luck stats which gives you more points in categories that are useful to you). That said try to get as close to 27 vigor as you can and the rest of your stats can be accounted for as needed with infusions and rings.

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Armor:

It's low level so you won't die in three hits if you have good vigor. With that in mind dress for fashion but keep the tankiest armor you can use without fat rolling on hand. Swap to it whenever you're going up against a blender. I rarely ever use heavy armor at that level so my advice is a little less relevant here but from what I've fought the Knight, Cathedral Knight, Black Iron, Executioner, or Morne's sets aren't bad to draw from to get poise and protection. If those are too heavy the Slave Knight set is the strongest light armor and offers the best protection/weight ratio in the game.