In an ideal world SWT would have access to sidings at Woking and Guildford, that would allow many more services to turnround at those locations and restart their next services right time subject to crew availability. In my opinion that would enable services to get back to normal much earlier and preferably before the evening peak.
All the electrified sidings are available to swt at Guildford. (up carriage and north box on down) also generally a platform at guildford can be used to hold for a while and turn around stock, though not massive capacity.
#2 siding on the upside at country end woking is electrified and used by swt at times as are east end sidings at london end downside which are regularly used as is platform 6 at woking.
More of the sidings at woking are due to be upgraded and electrified ( and i think some may be cet'd) for swt use in line with the increase in rolling stock, though not sure when this is going to happen.