I'll be frank, your gains are modest, and people take for granted what even a 0.25" increase is like in circumference (with respect to volume and thickness/width). The reality is that
Androfill has become increasingly conservative with their volumes, something you see with provides like
PhalloFILL as it tends to provide better overall aesthetic results over time (think of it as incrementally laying tiles so that they align evenly, instead of rushing a project and having a floor with asymmetries everywhere).
What's most notable in your circumstance is that you have a long shaft (7 inchers and above require more product to yield more
Girth), so hearing a 0.35" gain based on 19 mL's is on the lower end, but not entirely surprising (especially if you may have seen some early loss to dissipation, which is uncommon but possible).
Given your length, you may see this being a marathon and not a race. Also, be sure to supplement yourself with hydration and nutrients, and avoid tanning beds. Hope that helps.