SS 5W-30 = 10.3 cSt / 6.7% Noack / ~8% ester
XL 5W-30 = 11.3 cSt / 9.4% Noack / no ester
OE 5W-30 = 11.0 cSt / 9.4% Noack / no ester
It's likely the base oil viscosity of the SS 5W-30 is as viscous or more viscous than the XL and OE 5W-30 with less VII load thanks to better quality base oils. I'd rather have an oil that starts at 10.3 and ends at 10.0 than one that starts at 11.0 and ends at 9.5.
230°F is a normal sump temp. It's typical of engine oil to operate at +20-40°F above coolant temp. Nothing concerning there. Especially a top shelf synthetic like SS, it could hum at 260°F and be fine.