I am not saying one way or the other whether there were purity issues. Sounds like at least one of the batches may have been bad. Would be interesting though to see whether anybody was injecting IM and still having the knots/welts.
For what its worth I just finished one toptop kit and am now using Godt240 and haven't notice any differences. Built my way up to 4 IUs of toptop brand and starting see some effects at that dose (muscle fullness,slight tingling of hands,etc). Am now on 6IU of godt240 (4IU preworkout and 2 IU late afternoon) and those effects have been slightly enhanced. In both cases I had no welts/knots. This is my first GH run however and I don't have bloods so I am not exactly an expert. Would love to get my hands on pharma grade but I just can't afford it.