And now it's time for the Covid "I guess" lumber shortage

Thanks, The stringers are not cut(solid) which as you know makes them stronger than cut. A notched stringer is limited to 6' without support or a center stringer. A solid stringer can span up to 16' horizontal using 2x12 #2SYP or better, I did it that way on purpose. 75# PLF total load along the 12' horizontal face of the stringer is well within the carrying capacity of the lumber. Cutting stringers is a dreaded job. Plus I may redo it seems a bit steep to me, I think it is about 40+ degrees. Thanks for the input.

Lumber is priced similar to gasoline, you are charged the replacement price or "todays" price typically.
Yeh, but....
Your talking about strength of the stringer. The treads should be supported every 16" min for 2x's.