Haven't tried out a squid trainer at all just a cheap 20 dollar aliexpress kraken clone and the AS squiddy AL but I think the only thing from squid clone wise I'm gonna get next is probably a AS Madko or Nami. I've been trying to get the shortstop down myself too the past few days here and it's rough getting the right motion with your fingers for the handles to come up and it helps to use something neutral or slightly handle biased. Hope they find your Serif soon because that sounds scary as hell to lose
Appreciate the comment!! I hope they find my knife too. I would say get the nami clone over the Madko clone. Nami is fav flipper and I heard great things about the as clone.