Low Oil Pressure...OH MY!!

[bleengbleeng]

I've been running her hard here and there. 95% of the time I am towing a 4000 pound cargo trailer or 6000 wakeboard boat, at which times I baby it, low rpms with the edge kit on 2.
Yes I said edge kit (5stage).
at acceleration I am at around 70#'s of pressure on 5-40 fully synthetic.
at idle when 200 degrees warm she purs at or just below the 30 psi redline mark on my stock oil pressure gauge.
I just had the oil changed, what could be causing this?
Has the motor already begun to deteriorate (50K 2003 6.6)?
Is it the light synthetic oil? do they even make a 15-40 f synthetic?
Thanks for your help, I just want to make sure she is healthy.

Jamal from Oregon

[bleengbleeng]

I should have read other low oil pressure posts, it sounds like 20-30 pounds is perfectly normal at idle, thanks yall.

[duramaxin14]

If it gets any lower then that take your dipstick out if it spells like fuel it injectors