If timing light is flashing up to 10k you've got spark. As for adjusting the timing the stock bikes don't really give you any ability to advance or retard the ignition manually. The stock pickups are also adequate so no advantage in changing them as long as the are working. You might actually next try to look at the timing itself by pointing light onto the flywheel. That will require removing cover on left side. The flywheel will have the F and T marks on it. You will see the ignition advance as you Rev engine. Repeat for both plug leads.

The stock coils work fine, but the RS125 coils which are same as the RS250 coils are much bigger producing a better spark. If you search for Rs250 coils you may not find them or will overpay for a used set. If you search for rs125 you can still find new ones, just gotta buy two. You will need to make brackets for the RS coils as well as install connectors if you want a proper fit. I found this pic of my bike showing right side. Left is similar. It's not a trivial swap out so I'd think it's best to get yourself sorted with stock coils before going down this path.

I think that left plug looks fine. I know the mixture screws are difficult to get to, but you really should be adjusting them when the bike is idling. And, mixture screw not doing much once you get rpms up. They are totally out of the picture above a few thousand rpm.

Good luck moving. I'm starting my seasonal migration from Wisconsin to Texas today.
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MC28 SP