If you are assured that a CLI will be a soft pull, then go for it. But at 36% curent util,l it would take a heftty CLI to make much diff. And remember that FICO is usually less than half of what a mortgage lendor considers. I would be more concerned about bank balances, assets, ect. when applying for a mortgage than the minimal effect of a quick CLI on my already good FICO score upon appying.
Since you are apping for a mortgage within the next month, here is my advice. Even if you get a CLI with a soft pull, the CLI may not even hit your CR for two months, and may gain minimal awe from your mortgage agent.
And I have person after person tell me that they talk to a customer disservice rep who tells them that the CLI willl not result in a hard pull, and the rep has no idea whatsoever what a hard pull even is, And it then pops up, with an immediate -10 hit.
The CCCs seem to be much more prompt in reporting neg info that postive info, so you might see a hard inq hit your CR even before the CLI posts, and thus hurt you.
I simply would leave it alone, and not take the chance on the minimal gain against the potential inq hitting first. IMHO. It aint worth it!
