I've had my Veritas for prob close to a year now (which is practically a lifetime in 'vape years') and it is one of the few - at times the only - dripper that has remained in my 'daily rotation' regardless of what else I've acquired, gotten rid of, become enamored with, etc. it's just a great RDA all around. Not THE best flavor - but certainly in the top 3-4. Not very easy to build - but well worth the effort. It is solid, dependable, super easy to re-drip (I drip in through the air hole), never leaks, it looks great has the perfect amount of airflow for me, etc, etc. so it may not be the absolute best flavor or super 'cloudy'...but what it offers me is the best 'all-around' experience. I have the authentic - but to be honest - I had a chance to compare it to the EHPro version clone and I literally could not find a single difference at all!
As for building it - I keep it simple - a single, 6-8 wrap, 24ga (kanthan) horizontal coil wicked with Japanese cotton, 'U' style and cut the ends just long enough to touch the bottom of the deck on either side. This build never lets me down and always performs flawlessly.
PS - re your original post - it does very much sound like machine oil caked in the 'hard to reach/clean' areas to me as well. Your plan for the long soak and rinse will most likely solve your problem. Also, swapping your insulator is a must in your situation as well. Good luck!