if i am reading this right.you are on trt 100 - 125 mgs per week for 7years continually, now you are blasting with 600 mgs per week. question? how many weeks are you into your blast of 600?? it is possible 600 mgs is too much for you causing estrogen to be hi. You did not mention AI's or other aas on cycle,,,,, since you state you did many cycles your receptors could need more to get the effects you did on a lower dose (very possible)
this also depends on how you ran those other cycles,, long short etc. too many variables but IMO check estor. & as KC17 said only way is bloods.. You could also lower the dose & see how you feel.. I would not raise dose before a blood test but I would lower before a blood test & see how you feel. more info need to be given to give a more precise answer of what might be a contributing factor but it IS NOT MEDICAL ADVICE..
I think nelson might have miss understood your post I know he responds to so many & it is easy to misread a thread when you go thru thousands. Give some more precise info on what you are doing & see what replies you get.