Yes, I understand it´s seen like some kind of puzzle where different combinations create different meanings. Analyzing the meaning of a single verb form beginning from the last bricks doesn´t sound impossible.

What in my level confuses me the most is the difference between

V + sa and

V + tense mark (especially simple present which means habitual action) + sa.

I studied some examples yesterday and noticed that the difference is not very strict. As the matter of fact my word "counter-reality" may be too strong to describe V + sa. It´s more about hypothetical situations whose probability the speaker is evaluating when he is making these choises.

A couple of examples:

1. Fazla içersen sarhoş olursun. (You might go and do that but you know the consequenses.)

2. Her ne zaman çok kahve içsem uyuyamam. (That´s why I don´t.)

and

1. Her ne zaman İstanbul´a gelirsen bizi ziyaret edebilirsin. (I´m being hopeful, of course you will come one day.)

2. Her ne zaman Bursa´ya gitsek dağa tırmanırız. (I wouldn´t be so sure it will ever happen.)

Is there any idea in my interpretations?