Nice room. You said you're having trouble with the tight pkts.
One of the 'secrets' of playing on a diamond ( or any tight pkt table )
is to get more angle position than on a loose pkt table.
Unless you're shooting the ball into the middle of the pkt,
you need more angle so you put less 'heat ' on the object ball.
Slower OB speed makes it easier to pocket it in a tight pkt.
Good luck
One of the 'secrets' of playing on a diamond ( or any tight pkt table )
is to get more angle position than on a loose pkt table.
Unless you're shooting the ball into the middle of the pkt,
you need more angle so you put less 'heat ' on the object ball.
Slower OB speed makes it easier to pocket it in a tight pkt.
Good luck