No disrespect meant to you but I wondered if you knew about tyres when you put comfort is king yet you have 19" wheels with 40 profile tyres. For decades now the fashion has been to have bigger wheels and wider width shorter height sidewalls tyres. This is the equivalent of wearing a party frock and high heels when you really need to be in sensible clothes (nearer suiting race tracks than our 3rd-world roads).
The size of the wheels is primarily to get over the brakes and take fully loaded weight of the car, the tyre size is also about taking the weight of the fully loaded car.
The tyres are a very undervalued very complex very important component on the car, they have great effect on the braking, steering, suspension, road holding, ride comfort and noise. The size of the tyres in themselves in road holding and grip are not that greatly influenced within a the range of sizes the manufacturer offers but more abut the design, build and composition of the actual tyre chosen or compared. So say a 215/55ZR15 tyre of one make and model could be superior to, and outperform, a 235/40/ZR19 of another make and model.
Just for your info some of the sizes given for tyres are nominal, good enough for size comparisons but not strictly accurate, if you look in a tyre manufacturer's catalogue you will see the tyres can vary in size very slightly and things like new tread depth can vary, e.g. one tyre may start with 7-8 mm tread depth against another that starts with 6.5 mm. That doesn't mean you've been diddled out of 0.5-1.5 mm of tread depth, different tyres wear the tread depths at different rates (though much will be about the car, how and where it's driven).
Have a look at the links below to help see the differences in different tyre sizes to your car. It may help you to know that 80% profile tyres were a standard decades back (and well before that 100%) and 70% was low-profile, and 13" and 14" wheels were standard, 15" for sportier and/or heavier cars (the cars then weren't as bloated and lardy as they are now though, they were much lighter).
Have a look at the 'Tyres & Wheels' forum on this site (link below) for all those swapping from larger wheels and tyres to smaller wheels and tyres for comfort (you do not lose much, if any, handling but it depends on the tyres you choose), you can no doubt also find such threads on this forum. You can also sometimes see these changes in the 'Wheels & Tyres For Sale' and 'Swap Zone' in the 'Marketplace' section of this site.
HTH.
'WhatTyre' - 'How to read your tyre size' - https://whattyre.com/how-to-read-your-tyre-size/
Tyre size calculator - https://tiresize.com/tyre-size-calculator/
'Tyres & Wheels' - https://www.briskoda.net/forums/forum/213-tyres-wheels/
'Wheels & Tyres For Sale' - https://www.briskoda.net/forums/forum/333-wheels-tyres-for-sale/
'Swap Zone' - https://www.briskoda.net/forums/forum/272-swap-zone/