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I tend to just leave it alone once mounted, as long as the wrench lasts for one mounting session its fine. Do you happen to know if it's a proprietary wrench by any chance? 11.625" should fit will with a 12.5" barrel and ASR mount but I know for sure soon enough.
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It's a proprietary wrench. It hooks around where the gas tube slides in. When i had my issue with the wrench I offered suggestions to improve the material or make it a closed wrench.
The directions weren't really clear on what shims to use. So with playing with different combos, talking the nut on/off, it really wore out the wrench. I needed two wrenches for the first install. I ended up getting a new upper and the wrenches were so warped I couldn't get the nut off without hammering it.
You should have .200 +/- of clearance from the threads