PIC, SPIC, PICUS, P1/US - As far as applying for your licence is concerned they are all the same. You should know that your integrated course requires a minimum of 100PIC for initial licence issue, hence you already have it.
I believe the hours i fly in a multi crew environment don`t count as PIC but as Supervised Pilot in Command, SPIC
Not necessarily true. Assuming your aircraft is a certified multi-crew aircraft then you will log PICUS when it's your sector and P2 when it's the captains sector.
If you are UK based I suggest you go to
www.caa.co.uk and download LASORs 2006