Sorry guys but I beg to differ.
On stock setups and even with a spacer, I have seen oil pressure drop momentarily on track under severe driving conditions due to oil not being picked up because sucking air instead of oil.
So my opinion is that a decent baffle set up can only help this issue to guarantee that you have a constant supply of oil to the engine.
Similar to baffles in your fuel tank which are designed to stop the fuel from moving around causing poor performance, fuel starvation and detonation.
Even then this can be improved on by fitting an external swirl tank and fuel pump.
Just my opinion based on my real life experiences and not information gleaned from the internet.
Your choice of proposed spacer/sump upgrade will predominantly depend on which type of tracks you are proposing to use as some are more demanding than others due to more or less corners etc.