The crystal is most probably 11.0592MHz rather than just 11.05, isn't it? You want precise timing so you must be precise in your terms, too.

With autoreloaded timer, you need to set TH only once, at the beginning, before the first loop. You don't want to start and stop the timer, but leave it running freely. If you set TH to reload value 0, the frequency of the timer overflow will be 11059200/12/256=3600Hz. So, if you count 3600 overflows, that will give you an exact 1 second timing.

JW