It's often useful to skillfully drain balls to send them back up to the upper playfield when the ball saver is active
A good stack is Ace in the Hole, No Limit Multiball, and a Poker Corner mode (Change Gears, preferably). Start the Poker Corner mode first.
Poker Corner modes are qualified by completing poker hands (left and right ramps). Starting Poker Corner re-qualifies Ace in the Hole.
Hit gate on top playfield to lite Ace in the Hole locks. Capture ball, then bash on it to start Ace in the Hole multiball.
During Ace In The Hole MB, bash the upper level lock again to re-open it, then lock another ball, for add-a-ball.
Time your plunge to reach the end of the shooter lane when the light is on what you want. Usually Advance Hold 'Em is best choice.
Shoot orbits during multiball to collect Side Pots. 10 Side Pots lights extra ball.
Know Your Outs and A Chip and a Chair are less risky in multiball. They also synergize well with No Limit because they all use drop targets.
In single-ball play, each tell in Spot the Tell makes a unique sound when revealed. You can memorize their fixed positions and play by ear.
At start of Ace In The Hole MB, if you drain from upper level, let ball drain entirely, ball saver will plunge it again to upper level.