yeah 20% is fairly low, but actual life function-being able to walk to mail box-maybe walk dog walk with SO- sleep without getting breathless-

You no doubt know PLENTY about cardiac function etc-I learned more about autoimmune vascilitis than I ever planned to(wife has polyarteritis nodosa or Churg Strauss syndrome depends on which rheumatologist we consult)
Yeah great motivator
My wife still have unstable angina-28 episodes since her last discharge-5-1-2013-after her LAD MI-angioplasty stenting- re-admission angioplasty- then another readmission angiography-all in 13 days or so-they did what they could all the usual meds+ renexa-NTG -no good answer to "why does she still have angina chest pain-always at rest?"
Well- we had more time-so we finally figured out-the WHY -it was what should have been obvious-but never is-her vasculitis wasn't adequately controlled-
Rheumatologist are kinda between a rock and a hard place-very toxic meds vs toxic disease

Hope you get good news EF wise-but function is improving-so....
You lucked out that your DOC had the guts to treat you with Testosterone-the anti-testosterone lobby"not a disease state just part of aging" backlash from officious busybodies(who are probably getting T or HGH on the quiet) has started
Granted it probably is being over prescribed-and probably does increase MI risk in many cases
but quality of life-worth some risk-these folks are adults...... make it their choice

Your case is OBVIOUS- HOME RUN-heck low T might have contributed to your MIs-it is a multifunction hormone-who knows....