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I am a locksmith and have done this many times before: the more 'individual keys' (called change keys) you have under one master, the less secure the system is. 134 changes under one master shouldn'd be an issue, as I recall weslock has 10 depths. The key is to keep the steps (variance between the master and change cuts) at least 2, and also to keep the MACS (difference of adjacent cuts on one key) within weslocks tolerances, usually 5-7 (i.e. a 1 cut next to a 9 cut is too far) depth measurments. If your local locksmith isn't keeping up your system, get a new 'smith. To be the MOST secure, group your buildings together so that you have maybe 5 masters and new changes under each. Shop your services around, I'm sure any locksmtih worth his title will be able to service your needs quite well. Look for someone who advertizes that he is an ALOA member, and ideally has a CML certification. What often happens with big rekey jobs is that the smith will just grab random keys from the bin and put the master under them, which leads to interchange (where keys that aren't supposed to work do). The biggest thing to remember is that pin tumbler locks (which you have) are inherently easy to manipulate with a little knowledge and a file (you already referenced lockpicking101.com, read up and you'll see why). It's not hard to get it right, just be aware that you have to pay for it.
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