Mixing makeup products??

Sooo im in a dilemma. Ive been taking Retin-A-micro and clindamyacin for acne and its helped A TON! i still have red marks, maybe scars? from past zits (even though I feel they're not scars and they're just zits or clogged deep deep down). Anyways, has anyone ever used the L'bri product line? I feel like im using too many different products from different makers on my face. I wash with Cetaphil (i wont change cuz the derm. told me to use that and its worked), I have estee lauder foundation that i sometimes use otherwise just Neutrogena mineral powder, then I've been using the L'bri moisturizer cuz its all aloe/natural based or sometimes Clinique's moisturizing lotion...is it best to stick with one line of products? I dont want to do a 3-step with any product just because the derm. advised against it. Any suggestions would be greatly appreciated!!