Even when I see great results I always wanna try something else eventually.
I'm like that as well! I like trying different things to see if they can make great results even better. I have learned though that you should only do this one product at a time. That way if the new product breaks you out, you know right away what broke you out. Adding to many things at once will make that a little difficult.
I love trying new products constantly, I can't help it. Sometimes, when I'm not even done one cleanser, I see one I like on the aisle and I pick it up. This isn't good, since some/most cleansers requires you to constantly use them for them to effectively help. I guess this is because I'm still on the hunt for my 'holy grail' cleanser. Sometimes, I think I found it, but then I see something 'better' on the aisle and I'm extremely tempted to try it.
I really believe that for me, switching products was a main factor in my break outs (under the skin, flesh colored but VERY stubborn and all over)
I promised myself that with starting tretenoin cream I would stick to one regimen for a year and honestly I am clear and my skin tone is improving every day. As soon as I start to think about switching it up I try to remind myself of other times where I'd break out 2-3 weeks after starting something new and all the other problems (dryness, redness etc.)
Just my 2 cents.