No, you can't just add a larger counter weight. The cartridge's compliance has no relationship to it's weight. You will have to add head shell weights to the arm and/or heavier screws. You will probably need the larger counter weight to handle this. The V12 is my favorite SME but it is still pretty light at 12 gm effective mass. You would have to add head shell weight to it as well just not as much. the best way to find out where you are is by using a Test record with vertical and lateral resonance bands like the Hi Fi News Analog Test LP. You add mass until you get "the shakes" between 8 and 10 Hz. Get it down there and you will note a healthy improvement in bass detail and dynamics.
Getting kicked out of the groove requires a healthy miss match but I have seen it happen. Yours truly mounted an original Koetsu Rosewood in a Transcriptors Vestigial arm. The arm bounced out of the groove and because of the anti skate kept bouncing backwards right off the rim of the record:))) Experience is always the best teacher. Thus I learned about cartridge/tonearm resonance. Fortunately, the cartridge was not harmed and I got a more suitable arm. This was on an LP 12.
Getting kicked out of the groove requires a healthy miss match but I have seen it happen. Yours truly mounted an original Koetsu Rosewood in a Transcriptors Vestigial arm. The arm bounced out of the groove and because of the anti skate kept bouncing backwards right off the rim of the record:))) Experience is always the best teacher. Thus I learned about cartridge/tonearm resonance. Fortunately, the cartridge was not harmed and I got a more suitable arm. This was on an LP 12.