of course, now is the time when mining even on a laptop is more effective than it will be at the GPU in half a year 

we can change any part of coin rules, but I personally see no reason to do it.

Are messages like this normal?
Couldn't submit block: 00efb4638d3fdcce5f0748e7b657632e160739094465425e3cfb98dda7f0cee9
Reason: Block not accepted - probably too late
Or am i doing something wrong?

also, it  happens all time for me...
i think because of my Internet connection slow. 

Try to decrease "--scan-time" to 15 or something. If i understand it correctly the miner checks every --scan-time=seconds if a block was already submited, if not it continues to search this block, if it got submited it searches for the new block.
In other words: if your miner only checks every 30 seconds but someone found the block 5 seconds after you start mining for it, you would mine for 25 seconds on an old block.

you have any miner to mine it on linux vps ?

Are the percentages of all the kind of blocks known?

I am interested in CPU mining... Is there a step by step process on how to mine Soldo or SLD token? what is the minimum system requirements for mining?

nope.