If you are focusing on MVP, you should get an Alice shield.
Alice card - -40% damage received from Boss monsters, BUT +40% damage received from normal mobs
So, you would have to use this shield when it's appropriate, as the +40% might hurt sometimes.
For example, a weak mob like familiars from dracula should warrant you using the alice.
while Alice is a bad choice strong mobs like garm babies from garm
You might also want to that raydric garment, or one of the elemental resistance garments. Again, it's up to your discretion, if you know the elemental attacks will hurt, you might want to use the elemental resistance garments instead.
Some basic elemental resistance garments
1. Jakk - -30% fire
2. Marse - -30% water
3. Hode - -30% earth
4. Dustiness - -30% wind
5. Orc Zombie - 30% undead
6. Isis - 30% shadow
Of course there are more suggestions for MVPing as a knight, but these are just a few which I think are important to some extent. Thanks for reading.
Sidenote: You might want to use Di instead of Bk, the HP increase is quite useful.