Because you have almost no sph and a significant amount of cyl, I’d really focus on your environment and habits trying to find out where the difference within the eye is coming from. Basement flat with high window? Roof window? Spot lamp from the left? Looking down to the laptop screen? Tilting head? Main monitor on one side? Driving a lot in strong sunshine with various solutions of shielding? Watching movies from the sofa always taking the same position side ways? Current glasses cutting your vision in half? other?
Because you have almost no sph and a significant amount of cyl, it will be a bit more challenging to measure diopters for yourself. But despite the difference in sph and cyl, actually your overall correction is still quite low. So bit of a wild card for the start, instead of cm measurement, I’d focus on reading Snellen at 6m without glasses, with old glasses, with new glasses. And observe what you can read effortlessly, with a bit of awareness/blinking/pushing and with trying hard. When it’s blurry is it fading away greyish or is it same black just bold letters overlapping? Is it blurry or is it double vision (2 sharp images not aligned) or ghosting in a certain direction (1 sharp and 1 blurry image not aligned)?
Then walk close to the Snellen chart without corrections / with old glasses / with new glasses and measure how far you can walk from the Snellen before you can no longer read the 20/20 line.
When you look at a Snellen at 3m, at 6m and at 1.5m (yes, I know, this is a non standard distance) do you see the different parts of the Snellen chart differently especially when you do this without corrections? Which part goes greyish first before all goes unreadable?
If you take a book, can you read it without glasses? at what distance? Do you have a max distance for books with your glasses or is that way over your arm’s length?
A note on “what can you read”: it can be a bit blurry or with a bit of DV, but you have to be 100% certain that the O is not a C, the P is not an F etc. Don’t cheat to get better results.
These are needed to be observed in my view to be able to figure out if your left eye’s axis is 86 or 95. Though if you wore 86 for years and that used to give you clear vision (did your old glasses give you clear vision?) then most probably that is a good axis to work with.
By the way, if you drive: what are you wearing now for that when your new corrections are too disturbing/distorting and the old ones are not enough?
I don’t know about your habits, but have you worked on reducing smart phone time? screen time? have you found an outdoor hobby to get you distance vision time?
Depending on your observations, you may not need differential glasses. You may be able to work in front of the monitor without corrections. Or may not. You’ll have to make a judgement on old axis vs new axis. The observations and measurements will suggest what to drop from cyl, what to convert to sph maybe.