Try size: 512 x 768 (SD1.5) / 768 x 1024 (Pony)
Weights: 0.5~1
Clip skip: 2
Training material from bing
Pictures from CalicoMix V8.5 and CalicoMixPonyXL_v10
Note: When two characters sitting on a suitcase, the error rate with their legs is higher. Especially 1boy and 1girl will be more difficult to control than 2girls.