sav shedding problem!!!!!

im very new to monitors(this being my first 1) and i bought a sav from petco where they told me nothing about it. i got a book that told me alot of stuff i needed. but nothing about shedding problems! so hes a baby in a 40 gallon tank with dirt and 3 hiding spots. he has a basking spot of 100F, the hot end is 90F and the cool end is about 80F. at night the hot end is 80 and the cool end is 70. his toes wont shed properly and the tip of 1 had fallen off! i tried soaking him in warm water for 40 minutes and i got most skin off after trying for an hour but 3 of the other toes are much darker(almost black) and i couldnt get the skin off there. please help! any suggestions at all please!!!!

thank u