SPI → read about home bias on the forum (“Swiss overweight implies embracing additional volatility without necessarily gaining any expected return”)
S&P500 → already a huge part of VT
Not sure if you deliberately want to tilt large-cap global (mostly US) companies and increase the risk by increasing concentration - that’s not something inherently bad, and such portfolio depends on your preferences, investment strategy, and risk appetite (although scientific consensus says you should be doing exactly opposite - tilt small-cap value). In any case, it’s important to be aware of what you’re doing.