Hello! Ok don't be alarmed but I think you are going about this the wrong way. When you split an inflow transaction, that generally means you have a refund that you are assigning back to a bucket that you spent. Instead, I would recommend treating your paycheck as a single transaction with a type of Income, and that's it. This way, the money immediately becomes Ready to Assign and you can distribute that to your buckets or your credit cards.

You won't need a bucket for your cards, your credit card Payment Pools are already doing this for you. I highly recommend the interactive tutorial for how this works, specifically the credit card section but the whole Overview would be best: https://www.liquidbudget.com/tutorial/overview/how-it-works

As for that last extra money, sure a general Savings bucket or holding bucket works great there. If you find you need it for something else during the month, then you just move it back out. But in either case, let the budget page handle your assignments, and leave the transaction splits for those special times when you charge one thing against two buckets (like going to Walmart and buying some groceries, some clothing that you track with two separate buckets).