We only had 4 weekdays this week and not once did all four units get out, none had a full 10 car on Hounslow, and only one of those days managed a 458/5 on Hounslow.
And they were missing out stops on the 1737 Hounslow via Brentford in order to prevent excessive dwell times.
Yesterday had 8025 on it, and they planned it to not stop at Barnes Bridge, Chiswick, and Kew Bridge. The train departed 10 late, probably to prevent delays to the 1743 Shepperton via Richmond (which is Vauxhall > Clapham Jn then Putney), and the 1745 Hounslow via Richmond. It lost another 4 minutes at Vauxhall and was 10 late by Hounslow after the 3 minute allowance was covered, but lost 3-4 minutes at Whitton again, so then missed out St Margaret's, North Sheen, Queenstown Road, and Vauxhall (being routed via the "reversible" line).
http://www.realtimetrains.co.uk/train/W15369/2014/08/29/advanced
Tuesday, it left 6 late and being from P19 they shoved it down the reversible line, after calling at Vauxhall it was fast to Putney, which covered the 6 minute delay.
http://www.realtimetrains.co.uk/train/W15369/2014/08/26/advanced
Wednesday saw it run by 8005 and again left 6 late, but was fast to Wandsworth Town via the normal down lines. Again the delay was covered.
http://www.realtimetrains.co.uk/train/W15369/2014/08/27/advanced
Thursday was the day they got a 5-car out. Left Waterloo right time and fast to Putney, where it arrived 4 early and had to wait.
http://www.realtimetrains.co.uk/train/W15369/2014/08/28/advanced