My first reaction is that you are playing really really tight. Early on premiums are obviously good, but you can play more hands than that. For example, if a tight player opens from UTG at 15/30 and you're still 9-handed, if you're in position you can call with pretty much any pair, because your implied odds
are huge in that situation. Even if you're in middle position and it's unopened to you, it can be worth it to limp in with a pocket pair looking to hit a set, because some players are bad enough to pay you off if they hit top pair (and sometimes worse), no matter what.
Later on, your position and your opponents become a lot more important than your cards, because there is more pressure now to maintain your stack. There's a million different scenarios that you can get into, but basically you can open up a lot from the BTN and CO (and even the HJ) if it is folded to you, unless you think the blinds will be 3-betting a lot. You don't actually mind if they call a lot pre-flop because most people will just fit/fold the flop, so your c-bet is going to be successful ~70% of the time. If you're in the SB there are some good steal spots also, especially when you have less than 10bb's as you can just shove, negate your positional disadvantage, and have a reasonable risk/reward situation for yourself. With more than 10bb's it gets trickier, because shoving isn't as good of a play, but raising can work out badly too, as you can get into a big pot from out of position.
One thing I will add is that the table dynamics at the bubble can make some plays very correct or very incorrect. For example, if you and another player have 10bb's each, another player has 20bb's, and the last player has 2bb's, then in general you can't play a lot of hands, since the last player is about to go out. But if you are the guy with 10bb's, then you can abuse the guys with 10bb's and play a wide range, because they are likely to play extremely tight while they wait for the short stack to get knocked out.
So the cliffs is this: hand value is not as important in the later game as your reads, your position, the table dynamics, etc.