@markpao , excellent cartridge 👍
Sorry to be redundant but the best way to know if you have the correct base is to measure/confirm the actual Pivot of the tonearm (not it’s offset mount) is 258mm from center of platter Spindle.
Since you’ve measured/confirmed 258 P2S then you either have 1.) the wrong protractor or 2.) a too long out of spec armtube.