Speed of -a 7 mode very low !!

[blackrosemmt]

why when I use Hybrid attack the speed of -a 7 will very low comparing with -a 6

-a 6   Speed.#2.........:  350 kH/s
-a 7   Speed.#2.........:  53399 H/s

6 times lower  !!!

I'm using  for -a 6
hashcat -m 22000 -a 6  hash.hc22000 --increment --increment-min=2 --increment-max 8  ?d?d?d?d?d?d?d dictionary.dic  



and for -a 7
hashcat -m 22000 -a 7  hash.hc22000 --increment --increment-min=2 --increment-max 8  dictionary.dic  ?d?d?d?d?d?d?d 

Is there any way to keep -a 7 speed same as -a 6   ?