I'd run the base at 55 and call it a day.
Sent from my SM-G935T using Tapatalk
Depending on your pump that may significantly reduce output when you figure the flow numbers with boost included.
For example, look at this Racetronix 340lph pump :
http://www.racetronix.biz/itemdesc.asp?ic=RXP340M&eq=&Tp=
If you figure a base pressure of 45psi normally, and he runs 25psi of boost, that would put him at 70psi pressure for the pump under boost. This pump flows about 250lph at 70psi.
If you run the 55psi and add the 25psi of boost, the pump now sees 80psi under boost. The fuel flow for this pump at 80psi goes down to about 200lph.
The point I'm trying to illustrate is that if he is already running close to the max of what this pump can do (I am not saying he is, but perhaps in the future he might be) and you add another 10psi to the pump, your flow rate decreases that much more, which could potentially put him outside the safety range of that pump, and potentially run lean because of it.
Not saying this is what is going to happen, but just trying to show that adding 10psi to the base pressure can have effects that need to be taken into account when making sure your fuel pump can flow enough.
Here is the flow sheet for the DW300:
http://www.deatschwerks.com/resources/fuel-pump-tech/dw300-fuel-pump-tech . At 70psi it is around 285-290lph. At 80psi it is more around 260-265lph. That is a drop from about 76gph down to 69gph. May not be incredibly huge, but if he ends up pushing this to the max, that may be the difference between running fine and going so lean he detonates...