Splinters

A splinter should have sharp cards, Kings and Aces, Queen of trumps. It should be about 9-11 points filled with those cards. Without those cards, don't splinter, for example

I would not splinter on this hand. You can just bid 4♠ unless your system has a different way of treating the hand, for example if you play Bergen raises you can bid this as a strong Bergen - but don't upgrade it to a splinter which needs to have a certain character (Aces and Kings), not just a set amount of points.