incremental:ASCII - how to mask?

[pipss]

Learning how to crack my sample MS 2010 file with simple 6 characters password (two lowercase letters and 4 digits).

While cracking with john 

Code:

$ john --incremental --format=office-opencl johnofficehash

it takes 46 seconds to crack at speed 119771C/s. John manual says that it is "pre-defined incremental modes are "ASCII" (all 95 printable ASCII characters)" Machine is AWS p3 V100 w/ Openwall AMI.

While cracking with 

Code:

hashcat -m 9500 hashcatofficehash  -a 3 -i ?a?a?a?a?a?a?a

it shows 20% faster speed of 142000 compare to john's, but no result after 10 minutes of cracking. Machine is AWS p3 V100 w/ NVIDIA drivers and CUDA.

Am I missing the hashcat masking techique to emulate the john's one?