1- get a larger capacity trans pan. IMHO it's just more hot fluid to cool
2-transmission oil cooler. Yes 100% get the biggest cooler you can maybe two of them if it fits
3-steel braided lines cool looking but if you can bend lines buying a section of bulk line and bending it yourself is more than sufficient
4-change valve body with J-mod done. I'm sure Darrin can help with this
5-Castrol MerconV oil. I only use Ford MV but that is more or a matter of convince, Ford trans tech
I was thinking in change the Torque Converter but I don't know I accept suggestions. Yes a converter can make a lack luster TQ curve of the 4.6L feel amazing. No one converter fits all so what are your mods and what do you expect out of the car?