climbing LOP requires knowledge, confidence and a good all cylinder monitor
Ahh luxury! In my day... a somewhat unreliable CHT gauge mounted on a 'representative' cylinder was all I had. It made good engine management difficult, but not impossible.
More rule of thumb from where I worked (*dons helmet and flak jacket for incoming criticism*) was to lean to nearly rough running, squeeze in about another 10 l/hr, and monitor CHT to ensure limits were maintained. Seemed to work (never broke one, anyway).