When do you guys recommend to promote or reclass units? I've been playing under the 'old FE' approach and waiting until level 20 to use the Master Seal. I haven't really used Second Seals all that much. Now I'm reading something about 'internal levels' and 'cumulative levels' that may indicate it's better to promote/reclass as soon as you can, or as soon as you learn the abilities for that class (at level 10 or 15).