How much oil preasure do you think you need at an idle ? :?
25 lbs is nothing to worry about..that is plenty for hot idle in my opinion. As long as it goes up with the rpm who cares? How much oil clearance you running and what kind of pump? If it is a stock pump that is normal...I think 40 psi @ 2000 rpm is what chevrolet recomends.
I would definitely be concerned IF it used to carry more and then suddenly did not...but if it has always been that way I wouldn't sweat it too much.