How dim can these get quantitatively? Do these go down to 1%, or only 10% or 20% before the next step is just off?

Coming from someone in the industry, retrofit lamp dimming generally has less to do with the bulb and more to do with the dimmer. Some lighting control companies will have a list of products they have tested with their dimmers and how far it will dim down. You can expect with most dimmers 5-15%, higher end dimmers from more reputable companies will probably more consistently get you to 5% maybe to 1%. Electronic low voltage dimmers generally work better with LED's, if you have an older dimmer from the days of incandescent you probable will be looking at 15% and then off.

What is the difference between "title 20 compliant" and not? They seem identical: same lumens and wattage, but priced wildly differently.

Well, the title 20 compliance is for California only. If you don’t live in California you don’t need to buy them. Besides that’s a six pack. The other one is a four pack and that’s the one I bought. They’re dimmable, warm glow. I really enjoy them, they’re so easy on your eyes. For you I would recommend this one.

Will bulbs turn off completely when using a dimmer? some led bulbs remain on slightly.

That's more about the dimmer than about the bulb. If the dimmer shuts off completely, the bulb shuts off completely. If the bulb requires more power than the dimmer's lowest setting to put out a meaningful amount of light, then it will appear off. We just use dimmers to adjust light level and use the dimmer switch's switch function to turn on and off. If I turn the dimmer all the way down, these are still lit softly, that's our specific dimmers (Lutron toggle dimmers).

Brand	Philips LED
Light Type	LED
Special Feature	Dimmable, Energy Efficient
Wattage	8 watts
Bulb Shape Size	A19
Bulb Base	E26
Incandescent Equivalent Wattage	6E+1 Watts
Specific Uses For Product	Decoration
Light Color	Daylight White
Voltage	120 Volts
Unit Count	4.0 Count
Color Temperature	5000 Kelvin
Number of Items	4
Brightness	800 Lumen
Shape	Arbitrary(A)
Material	Glass
Model Name	PLC 8.5W(60W) A19 DL LED UDF 2PK
Indoor/Outdoor Usage	Indoor
Power Source	Corded Electric
Color Rendering Index	95
Power Consumption	60 Watts
Item Package Quantity	1
Light Source Type	LED
Item Weight	0.43 Kilograms
Light Source Wattage	8 Watts
Product Dimensions	2.36"W x 4.13"H
Accepted voltage frequency	100 to 120 Volts and 60 Hertz
Control Method	App
Average Life	15000 Hours
White Brightness	800 Lumens
Efficiency	High Efficiency
Style	8 Count (Pack of 1)
Global Trade Identification Number	50046677573480
Manufacturer	Signify North America Corporation
Part Number	573485
Item Weight	15.2 ounces
Item model number	573485
Size	8 Pack
Color	Daylight (5000k)
Finish	Clear
Number Of Pieces	8
Special Features	Dimmable, Energy Efficient
Included Components	8 A19 Bulbs
Batteries Included?	No
Batteries Required?	No
Warranty Description	3 year manufacturer warranty.

PHILIPS LED 60W A19 8-Pack Ultra Definition Daylight (5000K) 800 Lumen (8W = 60W) Dimmable Clear Flicker-Free Light Bulbs

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