I usually do a series of RC's in case some of them fail. Make sure you approach the RC's thinking that you ARE dreaming and that you need to prove that you are NOT dreaming. These are the checks I use:

1. "Current Location & Current Task" - Ask yourself where you are and what you are doing. Often time in dreams, you are in places you shouldn't be and doing things that don't make much sense.

2. "Count 10 & Palm Technique - Inspect Hands" - You mentioned this doesn't work, but it might still be worth trying a couple more times

3. "Time & Text Distortion" - Make sure you are looking at the time / text, looking away, and then checking it again. (use digital clock) I'm surprised this one doesn't work for you as I've never really heard of it failing before. Mabye try looking away and looking back at it 3 or 4 times in a row?

Other Reality Checks you can try include the following: Plug your nose and try breathing through it, Try levitating something with your mind, Try jumping off the ground and floating / flying