Back story: I thought I was pretty decent at Street Fighter 2 back in the day. Pulling off shoryukens and haduokens like nobody's business.
A few years ago, I built a LCD mame cab with IL battop sticks and I didn't have the same technical success that I had back in the arcade. Blamed it on the LCD lag and the sticks.
A year later, I then restored a dynamo cab with an VGA CRT monitor and using Happ Supers running Mame. A no go. Mame and the VGA monitor must be the culprit.
Flash forward to today. I converted a generic cab into a SF2 machine with JLF sticks, octagonal restrictor plates, CRT arcade monitor, and authentic CPS2 hardware running Super Street Fighter 2 Turbo.
Verdict: I actually suck now at Street Fighter 2. Maybe its the 43 year old reflexes?
Try Happ Competition sticks.
I cant imagine having an octagon feel to SFII movements... because they are rapid rolling motions, and IMO, should be smooth and fluid.
Supers are too clunky, IMO. High friction, and levers can get out of whack. (You might have also installed the actuator upside down)
Timing is sometimes remembered wrong. Keep practicing until you get on a roll... and eventually it will stick.
As for reflexes... yep, they can be reduced if you have not driven them hard, fast, and often enough.
The more you challenge them with quick action / reactions ... they will eventually get back to Ace levels.
Muscles have two main fiber types. One is slower.. but stronger... and the other is Quicker, but weaker. To have better speed, you need more quick-twitch fibers developed. They can and do develop... but only if you train with high speed drills / challenges. Might take a few weeks to a month, depending on how far off you are... and how hard you press the issue.
Another factor.. is the Subconscious mind. The more you do something.. the more you load it up with patterns / visual cues... and the more it will end up helping you in the near future.
On Age: As we age, everything works slower... especially due to toxins in our diets and environment... that cause poor circulation, and overall worse health / longevity. Getting back in shape, eating healthier, and certain plants/herbs/spices...etc.. can help flush toxins, and improve the body and mind, to a certain degree.
Meditation, and Yogic like breathing exercises, can really help in circulation, and a lot of other ways too. Add actual Yoga and or Tai Chi into the mix... and you can have even more impressive gains. Though, Tai Chi would take a lot longer to see/feel them... as it will take a long time just to understand and master the basic motions, and memorize the often long forms. Where as a good Yoga session will challenge your Core strength + flexibility + deep breathing all the while. Its a Lot harder than most people realize... especially if the instructor is giving you high level challenges... rather than mild to easy levels of exercises, duration, and intensity.
Ive not played SFII in some time... but I will say this: That after managing an Arcade for a few years... and seeing the level of some of the people
playing the later fighting games in the series (like xmen vs SF) ... Im not even sure about anything anymore. A lot of these kids seem to be Autistic, and
can remember exacting and complex patterns and situation... pulling them off instantly, and every time.
I supposed I may have done that to some degree back in the day... but I dont think it was anywhere near the level seen on some of these later games.
Maybe its just because I never spent the time learning and playing them.
My fav. fighter... turned out to be Killer Instinct. Its basically SFIIce, but with a lot more depth, and flair. I especially loved designing combos on the fly. The freedom to create so many unique combination, was simply awesome.
Like most games, I spent 95% of my time/efforts into mastering a single character (Orchid).
I doubt I could pull half the stuff off... that I used to. I used to have the Hold+Release Enders on Point (not an easy thing to do at all). When combined with a shadowmove, it was damn epic! = ) I even figured out? / learned a few broken-combos.. and I know that Ive certainly lost those, for sure.