Tried it with:
cloud base = 400x (T-Td)
SALR= 1.8 degrees/ 1000 ft
DALR= 3 degrees/ 1000 ft
cools with DALR up to cloud base on windward side, then cools with SALR until the summit, then warms with SALR as it descends on the leeward side until cloud base, then warms with DALR again.
But calculating this gives 20 degrees