Developing Tmax 100 with TMAX....underdeveloped?

I have tried two rolls of tmax 100 and have used the dilution 1 part TMAX and 4 parts water. Is that right? Because I have been getting underdeveloped negatives. I developed it at 75f for 7.5 minutes and that's what I got. I am going to go and try a higher concentration and see if that works but can anyone help me????

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