@pipworry
I would not worry about there being some gaps on your form, there are plenty of opportunities to to add this during the assessment, I would think the best opportunity to say this is during the medical history section. And if you are are worried they haven't added it in you can ask that they read back certain points they have written to make sure it is included.
So for kitchen activities, usually when someone has been given aids it is because they have been deemed a necessity, even though the PIP system is very crappy I do not think that they would try an argue your need for aids. They might ask a few questions maybe on what would happen if you were not to use them though. There is a chance you can score 4 points for this by justifying it as needing assistance, this is usually done if you maybe struggle to identify if food is cooked properly so need someone to tell you it is safe to eat, or if you would not be able to respond to dangers such as you could't tell if a hob had accidentally turned on and there was a tea towel on it or something.
For bathing from what i remember, it wasn't in the scope whether or not you picked up the wrong item in the shower as it was assumed that over time someone might develop a 'system' for managing this, which in your case you have. However, you would still likely score for aids as you would require the grab rail to safely navigate yourself into the bath.
You won't score for communication, as this refers to your technical ability to speak and understand words, however you can likely score for engaging if you struggle with social cues and responding to facial expressions, there is also a consideration for the mental health aspect of this too with adjusting to sight loss and social engagement.
For dressing it was introduced just as I was leaving that if the person has recently had reduced eye sight they can score for supervision, as it is likely they have not had chance to adjust to a system of dressing independently (such as colour co-ordinated wardrobes, keeping things in very specific areas) therefore was kind of seen as a 'grace' period.
For reading, you can either score for aids or unable to read. They'll likely make you do a reading chart, I may be wrong but I think if you could read size 16 that was considered adequate to use aids (a magnifying glass)
For going outdoors, you will definitely score for aids as you are utilising a cane. I can not remember this one very well though sorry, I do remember we had to ask a lot of questions to do with identifying colour, obstacles on paths, responding to dangers. So there is definitely a criteria for some getting standard rate and some getting enhanced I just don't remember what the difference was.
Also Im not sure how they address the reading charts thing if if it is over the phone, I'm assuming they are just being told to take peoples word for it.
Hope this helps, I am happy to answer more questions but please be aware I have not done this job for several months so everything might not be 100% accurate.