Congratulations on your new home and increased spending power, @bjjmuaythai! An app spree only consists of new credit apps, though. In your case, you went 2 for 6. Is that really amazing? You clickbaited me, bro!
It is fair game to apply for a credit line increase or app for a CLi. AmEx and Discover are tightening their everything. I am also fairly certain that the massive HP's from the Mortgage and previous applications turned them off if you applied to them last. Neither likes being late to the party.
Congratulations on your new found liquidity.