I have found that getting the C, third space, is harder than the G. I jump (pop) straight from F to G top line and find it difficult to get notes in between. About 6 months ago it was hit and miss getting that G but now it is consistent since using shape rather than air pressure. I spend at least 30 minutes a day for 3 weeks trying to get second space A.
Have a look at following video from about 3:16 for a leadpipe treat.

There are 2 videos in Bill Bing’s talks featuring Javier Gonzales that are well worth watching – another very relaxed virtuoso.