I know the web sight sucks what can you say!
Order the catalog it's much better. The rifles that C. Sharps and Shiloh offer are custom for the most part you can order it the way you want it. Pistol grip stocks are available from both companys as well as a plethora of other options.

"I found that with a straight grip and crescent buttplate, even a 30-30 is noticably more uncomfortable to shoot. "

I will agree with you that the Crescent buttplate is noticably uncomfortable to shoot. My fathers original winchester 1886 45/90 is brutal target shooting.

But I have not noticed a real difference in shooting between straight and pistol grip. Example I currently own a Marlin Cowboy 45/70 Straight stock and I owned a Marlin 1895 45/70 pistol grip (no longer own). Both are great hunting rifles BUT!!! at 7-8lbs they are realy brutal shooting target with (80-100+ rounds). I didn't realy notice any difference between the two.

On the other hand the Sharps at 14lbs is Soooo nice to shoot . You will get spoiled realy quick I have

There realy is no other rifle on the planet like a Sharps and no one else makes them better than C. Sharps and Shiloh Sharps.