Simple is good! My house recipe is real similar to your except that I use 2-row and Crystal 20 and a little munich. I recently made an experimental change by removing the Munich and splitting the base as 50% 2 ro and 50% MO. I really liked the results and may keep this change. Looking forward to how your MO based APA turns out.
I’ve been working on my IPA, APA, and Blonde all summer. I’d like them solid on their own but also end up with three clearly different beers. Kind of like primary colors in my keg palate
To my tastes, MO brings a bunch more flavor to the party. Best way I can explain it is to imagine what 10% more pale would do if it didn’t increase the alcohol or sweetness. Some say it’s more bready or crackery or toasty but I don’t like to imagine bread or crackers in my beer.
I think it’s probably good in anything
Maris Otter can be described as biscuit/nutty/toasty whereas a standard 2-row pale malt will usually be mildly grainy with a hint of sweetness.
I would not use MO in a number of styles, but that is all personal preference. I’ve known some people to think it is even inappropriate at 100% in APAs, but I quite enjoy it.
I hate to be a stick in the mud so don’t take it that way, but…
Life can still get a whole lot simpler. You can mash at about 150 F for 40 minutes instead of your schedule and get identical results. You should also be able to skip the yeast nutrient. And you can use a pack of US-05, which is almost the same as 1056, and thus skip having to make a yeast starter for the 1056.
Personally I would also kick up the Crystal to 40 or 60, but that’s really just personal preference – Crystal 10 will be great too.