Much easier for everyone if you just leave the autotip alone. I have never had service so poor that I would consider removing tips.
8 Norwegian: Sky, Jewel, Dawn, Epic, Pearl, Breakaway, Getaway, Escape
11 Windjammer: S/V Legacy X3, S/V Polynesia, S/V Caledonia, S/V Diamant, S/V Sagitta X2 S/V Mandalay X2, S/V Vela
HAL Statendam, MSC Divina