Bread-Bakers v108.n014.4

Steve says...
"Now the bottoms are a little hard".

He says he starts with the oven at 500 F and turns it down.  When I 
make bread I start with a cold oven and let it warm up.  I get great 
results that way.  The bread and rolls tend to raise a bit more as 
they slowly warm up and the inside gets cooked.  It sounds to me like 
the bottoms of your rolls are getting cooked faster then the insides 
and tops,  SO lower the heat!!  OR buy some of those insulated cookie sheets.