Hey there SM

,
Firstly,

on the enjoyable read above - good on ya

.
There are a few things here we need to look at though...
1. Temperature Correction of Gravity Mesurements - There's actually a 'Hydrometer Temperature Calibration' tool on Sheet 2 of the BIABacus but DON'T TAKE HOT GRAVITY READINGS!!! Wait until they are within ten degrees of your hydrometer calibration temperature. Temperature corrected gravity readings of very hot wort are always dodgy.
2. Trub Management - If you are using whole hops and are dealing with this small kettle size, perhaps just putting a colander over the mouth of your fermentor and pouring the kettle slowly into that will do the trick? Don't be overly worried about infection if you are pitching straight away and you are working indoors. You are mainly trying to avoid wild yeasts at that stage of the proceedings.
Another option, that would result in the clearest trub and maximum wort, I think, would be to use a narrow (3/8" or 9.5 mm) syphon with a scrubby (stainless steel wool - not the rusty kind) on the end. This will give a very good result with the only disadvantage being that it is a bit clumsy. Not as much as you'd think though.
3. Yeast Pitching - I wouldn't even worry about re-hydrating in your first few brews, if ever. Read
this thread and make your own decision. If I go to the trouble of re-hydrating, I go the extra step and acclimatise it to the actual wort.
4. Things Going 'Fast' - That's a really good point and it's one of the reasons that in the BIAB Checklist I wrote 7 years ago and I think we still have in the Master Guide here atm, emphasises setting up equipment and weighing things out the day before. It really does make a difference.
5. Multi-Step Mash - Don't worry about the 120 minute mash. That's fine. Normally, as far as I remember, your time between steps is 1 degree celsius per minute. Like everything, there's probably a heap of misinformation on this though so do a lot of googling on it. Personally, I am happy to just spend the extra time.
6. Clogging - Yes, it will happen if you use a fine screen over the mouth of your fermentor. A fine screen at the beginning of a gentle syphon such as suggested in 2 above is an entirely different matter. That doesn't clog.
7. Bag Porosity - Check that your bag is of the right porosity. I suspect from what I read and see on other forums that a lot of people are using bags for BIAB that are too coarse. You want 30 to 40 threads per centimetre. Either use a magnifying glass and ruler or take a photo of your cloth against a ruler with your mobile phone to count the threads.
Your BIABacus File
I've already mentioned (I think) how much harder smaller brews are in many ways. One thing is that they are harder to measure. The first thing I look at in a file though is Section P. What I am looking for is some agreement between EIK and EOBE (in later BIABacus versions EOBE is called EAW). Theoretically these should be the same. In practice, I 'd like to see them within 5%. In your case, they are nearly 20% different so this tells me there is definitely a big measurement error somewhere, more likely several.
I think the temperature thing I mentioned in 1 above will be a big culprit. Another culprit can be relying on the graduated marks of your vessels. These are often wrong believe it or not. Use your bathroom scales to check them before you brew next. Remember, one litre of water (not wort) weighs one kilogram.
Also consider using a stainless steel ruler to measure your kettle volumes if you aren't doing so already.
So, numbers wise, the only thing we can really tell for now is that we need to do the above before and during your next brew. The next few brews will then tell us if anything worrying is going on. I think you'll be right

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...
I am always really impressed when someone jumps straight into all-grain without brewing any other way before. You've done really well SM.
PP
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