I'm a big fan of "If it works, don't mess with it". If you're feeling good to great most days with the dose of E you're on and are not actively or needing to transition ASAP, why change things? Being on a low dose of E is an acceptable. There is no rule that says otherwise.
I've been on low dose E several times over the decades to help 'Reset' me emotionally. I tried transitioning in my early 20's, twice. Both times utter fails. Low dose E was a godsend. Seven years ago things need to change in my life starting with how I was NOT handling being trans. I started low dose again and again it did it's magic. I also actually started to take the trans-beast on for real. That also was like magic. For quite a number of years I've been on typical feminizing dose of E. I have a nice B cup. I live and present primarily as male. I'm not alone in this way. You just need to dress to minimize them. Being a former fatty snug fitting clothes and I never got along (in male mode). It was and is baggier clothes for me. No prob with the girls, even with a bra, which is often needed/appreciated to be wearing