I'd replace the fuel pump to block gasket 1st then monitor.
There's alot of pressure and oil misting going on in the bottom end when running and escaping pressure will find a way to get out.
You did good to clean the draft tube out but it relies on air flowing past the angled slot cut in the end to help make a low pressure area that helps to draw the pressure out. If you want to keep the extension on the draft tube you should cut the end at a similar angle as the original end to replicate the drafting it provides.
It's also SOP to get some oil drips out of a draft tube.
There's all sorts of baffles etc in the draft tube to cut down on the drips but some will always follow the pressurized air out.
Good luck
Dave
