that's not normal at all, i run plenty of advance around that area.
what is the trigger offset on the crank set to?
if that's too little in TS/MT then the advance will be raised and will det easier than you would think.
my offset is 80 degrees and no problems with det that i can tell, certainly nothing off boost. saying that i'm just in the process of sorting my map out due to turbo downgrade, not altered the timing at all though.