Get cheap magnetic stirrer with rack stand to hold analog termometer, thats it. You dont need digital fancy one.
Regarding 400mg brew. In my opinion too much hassle. All that additional solvents and high mg's will make pip for sure. No saying about scare tissue after long use. Test E 250-280 maximum.
So you shouldn't have to use 20% BB even at 400mg. I would only use probably 15%BB. You don't have to worry about it crashing as it will hold with only 10% but I would use 15%BB anyway.
So there's a few things that come to mind. The first thing is Test E is known for some batches to cause PIP no matter what and that's because it has something called carbolic acid in it sometimes. That is a problem, but there is a way to fix it you can cook off the Carbolic acid by adding just the carrier oil. No BA or BB, and cook it at 200 degrees Celsius 30 minutes.
The second thing is some compounds need to be made with a thicker oil like you said. However Test E is not one of those compounds and if it is a compound like that which is usually a short Ester or something like dhb you want to throw around 50% safflower oil in With 50% MCT, but I don't think that's the problem here.
The last thing that comes to mind and I see you've already fixed it which is a lot of time by not using a hot plate with Magnetic stir rod the hormone does not get suspended enough into the carrier oil and therefore it falls out of suspension after injection which is why you get that knot at the injection site witch is just the hormone left behind after the muscle absorbs the carrier oil, and that knot/hormone irritates the muscle causing PIP.
Also no you should never have to use G when making Test E. only for bases and very short answers at high concentrations.
Now the fact that you said you were able to make injectable winny in oil and it held says a lot. I'm assuming you had to cook the hell out of it to get it to hold correct? However I have never seen DHB at 150mg. In fact at anything above 100mg that does not cause PIP. That is one of the compounds I'm talking about when I say you need to add a little thicker carrier oil.
As far as a hot plate goes. yes that is all you need. You do not need a digital one, and there will come a time where you will not even need a thermometer only when cooking crazy stuff like bases or injectable winny.
Again back to the Test E, many people including myself can make it at 500mg with no PIP. So there's no reason you can't make it at 400mg without PIP. Therefore I would have to say it's your raw material.
I think I covered everything. If I left anything out or you have any other questions just let me know...
Actually send me a PM. I wanna pick your brain about the Winny....
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