You won’t be drawing 31” with that short recurve. Practice drawing til middle finger touches corner of mouth. 2117 prolly a little stiff so extra length over 28” a good thing. As for knocking point use a square or eyeball it so arrow on string sits 3/8” above rest. Use wraps and knots of dental floss as knock, finish with a drop of crazy glue. Knock arrow underneath homemade knocking point.