ae101 , tyre does affect top speed.
in track , tyre alone will easily differentiate 1s .
maybe what you mean is tyre is not the cause of mesi top speed drop...
but in general, even if after you turbocharge your car, there is no reason for the top speed to drop from 190->180 as you claim, little different yes, but not till extend of 10/15kmh
if a drop is noticeable after turbo charge... few things can be obvious
1. intakes, air intake play an important role... especially after you turbo charge them and they need to breath faster and more
2. supply. fuel supply in this case, make sure the fuel supply is adequate for your boost need
3. exhaust. eating too much without letting out ? that sure feel bad, same goes to your car too...
4. transmission. if i am not wrong, your vios is aged and the clutches might slip due to the "additional" work after you charge them... if the slip is continuos, maybe it will ended up in a repair soon enough... haha...
charging your car is fun... but tuning them right to where you want it to be, that is the pleasure... hahaha...
xbalance: nothing wrong with the data... is common i see people run their wheels at 220 250 or 300.. but when on road... whose ball and brain is big enough to getthem up to that speed ? hahaha... is just the matter of opportunity la... people want to know how fast they are for once in their life time.. so mar floor it when on machine ... hahhaa