Here's my technique I've use with varying degrees of success for several years.
1. Use Crisco
2 Use Crisco VERY SPARINGLY -- 1 Tablespoon is more than enough for a 12" DO. Use small amounts of Crisco and season more than once if necessary.
3. Make sure the item is placed so that any excess Crisco can drip off during seasoning. i.e. do not allow the Crisco to "Puddle." It WILL gum up.
If the Crisco puddles, you've used too much.
4. I season outside on the grill. My grill did NOT have a thermometer so I bought one from HD and mounted it on the lid. Works like a charm. I season in the neighborhood of 500 F. Season for 1hr. let cool. Season again if not satisfied.
5. Use OFTEN. Using seasons the seasoning.
6. Wash with very hot water (no detergent) and a brush. While still warm from the hot water wipe down with a Crisco saturated rag and wipe excess Crisco off with a paper towel or rag. I keep a small can of Crisco in the refer. just for this purpose.
OH I forgot:
Sometimes I"ll dry mine for just a minute over low heat on the stove before wiping down. Just long enough to dissipate any residual moisture.
Like I said: The FWIW department.
It works for me.
But I'm the
Bunglin' Idiot and Babblin' fool.

If it's not broken, you're not trying hard enough.