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I'm guessing Canna has printed directions on the labels of their products or , if not, it can be googled.

Have you checked your pH?

What are you growing in? What does "double strength feeding" mean? What are you doing for Mg and Ca? And in your last pic, I can see the edge of one of your other plants and it doesn't look fine, so you may want to post full plant pics and give up your details...it'll help someone help you.

I grow in soil without ever checking the pH of the water for my cannabis. It grows fine, just like all the other plants in my yard. To each his own, but I’d go crazy testing and adjusting the pH of every gallon I use on my plants, LOL! I’m sure your plants appreciate the effort, but that’s too...

Do yourself a favor...if you're in coco, add a little Epsom each and every time you feed. I use 1 gram per gallon, from day 1 to chop. CalMag, is adding N and Ca, which, if you don't need it, there's no need to feed it. Not to mention Epsom can be bought at any grocery, pharmacy or big box...

Check for pests....under the leaves. Otherwise, your plants look good enough to me.

This..."I haven't been pH'ing my water. I've been using RO water so I imagine its somewhere around neutral." Neutral is 7, and that's too high...and that's just assuming it's neutral. I'd take the time to learn about pH if your plan is to be successful in this endeavor.

Fading at 3 weeks in? I hope it's a 5 week strain.

Putting the autumn colors aside, your plant is showing a Mg shortage; yellowing between your veins and the purple stems. I would maintain my pH @ 6.5...much lower and you're missing Mg uptake.

It's not a N deficiency nor a Ca deficiency. It looks like an Mg issue, and for as small as the plant is, and as decent as the soil is you're using, it's most likely a pH issue, causing you the Mg issue. Do you know your pH?

What are you doing for Mg? This is what you're beginning to see. If you're questioning your pH....don't. BE SURE of it...it's an important variable to know and manage when running coco. And for the record, you don't need the latest and greatest pH probe...simple drops will get you there...

If you're in soil and you're running a pH from 5.8-6.5....this is your problem. Dial in your pH and see what the plant does. Until your pH is dialed in though, any additions will most likely have you chasing your tail.

Purple stems and petioles; unless they are genetically predisposed, they are strong indicators of an Mg shortage. Your pH of 6.75+ is a bit too high as is your soil pH if it's 7+ I would be sure of my pH in all three plants, and I'd be sure of my pH in terms of what I was feeding. Epsom salt...

You're at least paying attention to the details; nothing to worry about. A pointer; stop the foliar sprays....make her find her water via her roots.

Nothing worth having is easy....

Reference a VPD chart....if you have high humidity, raise your temps some....keep your air moving and you should be fine.

I am not a proponent of flushing to fix a problem, largely because it doesn't. If you have dry amendments in your soil, a flush isn't going to remove them per se...it will help leach out some of the nutrient, but it most likely won't solve anything. If it were me, I'd simply give them pH'd...

You are correct, I would avoid checking my run off pH, but knowing your soil pH would be useful. If you are indeed in soil, 6.5 pH is what you're looking for. 5.8 pH is for coco and other hydro methods.

If you have the means to check your pH, I would encourage you to do that. The contorted / twisted leaves, in all your pics would suggest pH.

You look a little short on K, and perhaps Ca, but you're deep into flower, so don't try and change the world. It may be best for you to take notes and use what you learn from this grow and apply it to your next. I wouldn't go chasing perfect leaves at this point; you're near the end. Looks...