Bun/Creatinine ratio when low can mean kidney stress. It's more than likely due to you being on tren, as tren is known to tax the kidneys as well as many other things in this lifestyle.
None of your numbers are way out of range, and I wouldn't be too worried. Your estradiol is more than likely elevated due to the tren causing a false high reading.
Next time get the ultra sensitive test as well as the total test that gives the reading>1500. It's $72 I believe and can be purchased through labsmd rather than privatemdlabs.