I have tried developing my 4x5 Ilford Hp5 using HC110 Dilution H (1:63) at 10 minutes using the taco method. I mixed 11ml of concentrated syrup with 693 to make 704ml of solution for my reel tank. I agitated for the first minute and for 10 seconds after that for every minute of the developing time.


The negatives have low contrast from what I see. See one of photo here which already been adjusted in Photoshop using the curves.

Is HC110 Dilution H causing the low contrast? Should I tried dilution B instead ?
Thanks