i wouldnt worry about the numbers, whether they are 60-20-40 or 3-1-2, its the same thing, put the manufacturers dosage to the test, check it with a metre, you will probably get quite a high EC, a lot of guys reckon to use half strength dilutions, i often use a fifth strength, like 10 ml/5ltr instead of the recommended 10ml/ltr, just check it with the metre and if the ec is ok then it should be fine.