yeah one way is sty head, Angle tarn to Langdale fell which i've heard is a carry (up and down).
other way is more out of the way, south past Eskdale fell, seathwaite, then walna scar to coniston. this is the way you'd recommend yes?
just seen another option that goes north from black sail hut via Scarth gap pass, over Honister then via Rosthwaite over greenup edge and easedale, to Grasmere. Don't know it myself.