Extended Crank 2015 FFV 5.7 Tundra!

Hi guys. Im having extended crank every time i leave the truck off for more than 2 or 3 hours.

Things i've replaced:
Fuel Pump (Replaced by a walbro355lph pump)
Fuel Filters
Air Filter
Cleaned Throttle Body
Replaced Spark Plugs
Added some Octane Booster to the Gas.
Replaced Fuel Rail Pressure regulator a year ago.

Did a test by installing an external Relay to my upgraded fuel pump so it will activate with they in ON position without cranking engine. I let the pump ON and flowing for about 2 minutes before trying to start the engine and STILL same issue. So im really starting to think this is not a fuel pressure issue.

I have no CELs whatsoever, not even vaccum leak cels.

Mods:
I have a throttle body spacer, cold air intake, long tube headers, dual 3" exhaust, walbro gss351g3 fuel pump and hptuners tune.

Im not from the US and my Tundra is an export. So no toyota dealerships available to update my ecu software.

However i have the Hptuners dongle. Can fix it somehow using the hptuners?
Or do any of you can come up with some ideas about this issue that by worth the shot to try?

 

Have you gone down this route?
https://static.nhtsa.gov/odi/tsbs/2013/SB-10061328-2273.pdf

 

Battery?

 

I'd side with TSB. Needs a reflash.

 

My 13 5.7 flex had the cranks with no start
It was tab 0166-19
A refresh and $1000 fuel pump fixed it!