xtol - thin negs

I've been using XTol with fairly good results, but always a bit thinner than HC 110. Today Using TRI-x 320 (120), 1:1 Rotary, 7.5, 8 and 10 min, no-prewet (as recommended by JOBO), all were way too thin. On half the roll of the 10 min roll, I processed using HC110. Gorgeous. Therefore, I knew they were properly exposed. I'm assuming the XTOL is the problem. All else remained the same. The above 2 tests were done with 2 different batches of XTOL. I have used it frequently in the recent past I've noticed my negs were thinner than desired. Any suggestions. Tues I'll call Kodak, but for now this is very disconcerting because most of my stuff is portraiture and I enjoy the low grain. thanks for any help carol

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