We use the 50WLRS straight out of the box and simply mark where 50% drag is on the arc. I know some guys who like to set their strike drag a little lower on the LRS (20-25% of b/s) so that they aren't getting into danger of line breakage when they push the drag over the button, I am not a fan personally as I feel it would reduce the hook up ratio significantly.
I personally don't think there is any reason to blueprint a Tiagra unless you REALLY want to get rid of the LRS feature and just have it as a 50W and if anything, I like the LRS better due to more range in the drag.
I remember once upon a time we had a Blue fella die and go deep, we had to back off the lever and crank up the preset to get more pressure on the fish. Wouldn't have needed to do that if we had the LRS
If you want to blueprint a reel, I'd say to go pick up an old Penn Inter II and send it away for new drag materials. Between their age and build components, the old Penn IIs are perfect candidates for organ transplants