Optimax is best using timing 6, boost setting is your preference, anything from Low Boost 9 up really, HB3 is a good compromise between driveability and performance. If you use Millers or the like, you can go up to timing 7-8. Use timing 9 if you have rocket fuel (104 ron).
Thing is WSL_WIL you've got to remember the boost and timing settings are made up of tiny steps. Also there's no point forever switching backwards and forwards between settings as the car will never adapt. Make a switch, drive it for a week, do a hundred miles, see what you think. And there's no point chasing big numbers if the car drives like a dog the majority of the time.
In regards to setting your car up using an SPS3 it's best to start at low settings and then build up, ideally monitoring sensors using VAG COM to see what's actually happening. Bear in mind if you set too high a setting for the given conditions/fuel then the ECU will pull back the adaptation levels these will remain at low levels until they are reset (TBA or alot of driving time) as such you won't benefit from altering settings if you've gone over the top to start with. There's no be all and end all setting for certain fuels as conditions change daily, we can recommend timing settings though. 3-5 for 95ron, 5-7 for 98ron, 7-9 for various race fuels.
Hope this helps.
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