3406E 5EK Power Up-grades

Hello. New to the forum.
I have been doing some research and reading a lot of the previous posts related to this topic and found some interesting info., yet i'm still a little unsure on a few things.
Here's what I have:
1995 W.Star 4964 day cab used on my Dairy Farm hauling heavy.
18 speed
4.10 rears/46k lb.
3406E 5EK 31620 (family#RCP893EZDARA) w/ a 500 hp flash(I think)
fuel temp and boost wires installed
turbo waste gate has been disabled, pulls 30lb boost with cold temps.
This unit has has yet to be opened up and rebuilt to my knowledge. Runs like a top with very little blow-by.
I have never liked this 500 hp program. The only good thing about the current 500 flash is that it has wicked low RPM torque.There was a 475 program in it when I bought it that if I remember correctly seemed stronger. This thing is just weak and underfueled. Even if I lug it in a long hard pull the Pyro. still barely ever sees over 900 Deg. (on the cold side). This tells me there is room for more fuel.?
Supposedly there is a Tech. at one of the local shops that is really good with Electronic Cat's. I was wondering what my options may be for a better flash, keeping in mind this program is weak. I do well to stay with 427 Macks.
I would greatly appreciate any thoughts or advice anyone has to offer so I might be better educated if and when I take my truck to the shop.
Thanks
Floyd

 

Thanks for the quick replies.
I have owned the truck since 1999 when it had 318,000 miles on it. I believe all of the components are stock.
However I agree, that before any steps are taken this needs to be verified.
That being said, do you have any recommendations on a flash for my engine, and what it's potential may be?
John, thanks for the advice, i have checked all that you have previously mentioned. I agree with you and always try to use the k.i.s.s. method when troubleshooting. Always check the simple(yet very critical)things first. I must admit i'm not sure what the CAC test stands for though?
Thanks again, your input is appreciated.
Floyd

 

Hahaha! Don't sell yourself short black dog!
Thank you. I should have known.
I've changed it out. Pressure tested it a couple years ago and it was garbage. Leaked like a seive.

 

Checked my turbo part # today. It's a cat re-man OR-7204. Anyone know if this is an acceptable match for my engine? Up to what horse power might this turbo support?
Thanks
Floyd

 

Thanks again Far Call