Next best option since a variation has been difficult to add?

Hey guys got a good seller on my hands – have been OOS for a couple months now. This is a 15pack bundle and I created a 20pack recently. Adding the 20pack as a variation has been nothing short of a nightmare and I still haven’t figured it out.

I’m debating just scratching the OG 15pack, changing the title to this 20pack listing since I’ve got 9 inputs already (quantity is the only difference. Reason being is two-fold.

1). Most commonly purchased quantity is 20.

2). PPC CPC is pretty high. At $16 profit/unit I can absorb $5 or so in ad spend per sale and still be at 25% margins roughly.

Advanced sellers – what would you do if you were me? 15pack is about $10 profit but PPC can gobble that up.

Thanks in advance