Help, torque converter question!

[11 6.2]

Ok I know this is prolly a newb ? But when I put the 3600 in my 06 it made such a huge difference because the lack of power.
My truck after it shifts (because I have the 6 spd) doesn't drop below 4500 rpms, I know obviously if I get a 3000 stall out of the hole it's gonna make it flash that high maybe a little higher. My question is will it keep the rpms higher at shifts too because it's a "looser" torque converter? Or will it not effect it because now I'm already so much higher over 3000 after shifts? I enjoy roll racing more which is why I'm wantin to know this before I spend $800+ on a TC.
For example now after the shifts my rpms drop to 4500 then starts climbing. Will the stall only let it drop to, let's say 5000?
Thanks in advance!