Hi Suresh
Increasing these timers will help for sure,but not much.Its better to tune other parameters like initial coding scheme,cleaner RF environment,UL & DL release delay,etc,etc….
Regarding TBF success rate formula,the formula you have mentioned is wrong,because how does attempts comes in numerator & success comes in denominator??
Now,in case TBF establishment success rate,it shouldn’t consider TBF drop,it will consider only blocking & MS no response.
Br\\
Bijoy