Performance increasing relative to variation

[Todeskuss]

I did as you suggested with the salt. The -m 10 salt (appended) worked fine but the speed wasn't so much increased

Code:

cudaHashcat64.exe -m 10 c0XXXX906aXXXXc1XXcdXX0bXXXXf4XX:56dbXXXXbababXXXXbe8d6XX -w 3 -a 3 --custom-charset1=56789 0.9?1?d?d?d?d?d?d?d?d?d?d?d?d

However when I did the -m 20 salt (prepended), I get an error of "Separator unmatched"

Code:

cudaHashcat64.exe -m 20 0.9:c0XXXX906aXXXXc1XXcdXX0bXXXXf4XX -w 3 -a 3 --custom-charset1=56789 ?1?d?d?d?d?d?d?d?d?d?d?d?56dbXXXXbababXXXXbe8d6XX

What did I do wrong?

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Also, is there a way to make oclHashcat change the right side more commonly as opposed to the left side, to increase my performance?