LAX, SFO and ATL leave London too early to make the connection.
What ? ? ? ? ?
VS41 leaves LHR for SFO at 15:30 (not Mondays)
VS23 leaves LHR for LAX at 14:35 (not Wednesdays)
VS4009 (code share on Delta metal) leaves LHR for ATL at 14:50
Even with the later morning schedule arriving at 11:10 all these flights are perfectly possible.