This post is a good start Draw calls and Defold
Having more render predicates will not help with performance it may even lower it.
If you have 150 models and they all have different textures you will end up with 150 dc because of the state changes. If you want to lower your draw calls you could try using sprite sheets for them, as far as I know this is not supported by Defold.
You will have to make them yourself in photoshop buy combining a lot of model textures and then move your UVs to match up again.
10 draw calls is not a lot, if your game is laggy it is probably something else. I haven’t done a lot of tests with models myself so unfortunately I am not sure how to optimise them fully.
Is your game slow with the models now or are you optimising before it gets slow?