From I8,u'll catch a 111 to PIMS,from there u will get on a 120 which will go to F-10.
The 121 goes from I-9 i think,to karachi company,from there catch a 120 to F-10.
To F-11 idk,but i think the 105 or 1C goes to G11.
The vans are max till 8pm,some are dependent on days also,like lawyers have a holiday on sunday,so some vans rarely come to F-8.
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The best is 111,from I-8/H-8 straight to F-8,single van no shit hassles.