The SOnic series has a mysteriously & strangely strong coverstock, to me. It seems to get most of its dry lanes properties from the high RG and low differential core. The original surface, 1500 grit polished, is almost essential to allow it to perform on lighter oils.
Yes, when left with a relatively aggressive cover finish, as in your case, you need to find more oil to use it effectively.
Try sanding it to 800 or 1000 or even higher grit before using a polish more like Storm's Xtra shine, which has the ability to take the surface up to 1500 or 2000 grit after polishing. Heck, even take it up to 2000 grit with an Abralon pad and then apply polish.
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"None are so blind as those who will not see."