Where did you do your PPL? How much more training can you do there? It looks neater going to fewer schools but it shouldn't matter - that's the whole point of modular. Some airlines have a three-school limit but I think that's more of a filter to keep the numbers down. Ultimately they only know what you tell them on your CV. Personally if I went to 6 different schools I would only mention the ones that matter: CPL, IR and MCC.