I thought that you used the better of your unshifted stat and your shifted stat when gaining a level in form.

Then I gained in form, got bad gains, and was told that it was my unadjusted natural stats that are compared with my in form stats. And I normally rely on using clothing to boost con, wis and int. But I resolved to gain out of form from this point onwards.

Then I got a form with 24 con, and my natural wis was now 18 without modifiers, so I gained in form expecting three practices from my natural stat, and great HP from my form's 24 con. But I had really poor hp gains.

Can someone enlighten me please?