300mgs of Test E seems a little excessive for HRT. I’m not against it but just seems out of the ordinary for a Dr. to prescribe that much. Especially E.
I understand Coach. I've been on and off legit HRT from a G.P. or Int. Med Dr. for about 15 years now, so a lot has gone into this.
My initial Dr. and I played around with things a lot. I've always preferred Enanthate to Cyp, as Cyp was my first cycle and I held water so much that when my bosses at the gym I worked at noticed that my cheeks explained my sudden increase in strength, picked a day when I was coming into work and greeted me by singing "Puff the Magic Dragon"

Also, cyp has benz in it, and Enanthate doesn't. 0 injection sting/pain with E.

I am very honest with my Drs., and told the first Dr. that I noticed when I used E for bbing purposes if I missed/didn't want a shot one week around day 10 I'd start crashing. I didn't want to come in weekly for shots (he wouldn't allow it otherwise), and I didn't want to do e.o.w. to avoid the crash. We settled on 1.75 mls every 10 days, and I'd test around 900ngs.
Fast forward to new Dr. We started doing 200mgs every week, and then my co-pay doubled so I gave 400mgs e.o.w. a try. Got bloodwork done in December, and was around 650 vs. 970ish IIRC doing weekly. This year my co-pay went down 75%. In reviewing my labs in Dec. I told my Dr. 650 was not acceptable, and that I could handle paying for weekly shots again. I brought a bunch of studies and info I found online, and explained to him that while 970 total T or so might seem great for most people, someone like me that was used to doing 500-750mgs a week was not going to get the same good feelings/benefits. I explained it as "used to feel like a race car, now I feel like a Pinto". I showed him that 1500ngs is considered truly supra, and he then for some reason wrote down "1200-1500" on paper in front of me. That's when he circled 1200 and told me that was as high as he was comfortable with, and my option if I wanted to go above that (find another Dr. which I don't wanna do). We'll see in a few weeks when I get blood drawn where I'm at with the 1.5 mls?