I think that’s awesome… If you’re not planning to sell it, then do what you like and what works for you! It’s definitely more art than science, but if you are planning to sell it there are standards to which one must adhere, and it can get pretty tedious. From what you’ve described, I’m of the opinion that you should do the minimum that you can that gets you to an end product you’re happy with. You’ve probably already seen it, but it might be good to re-read the article below. I would recommend paying particular attention to the “Tips for Setting Points” section.
https://discuss.eroscripts.com/t/how-to-get-started-with-scripting/2234
Here are the two things I wish I’d known when I started…
There’s a discussion in that article under “How to improve performance when stepping frame by frame in JFS and OFS” that describes decompressing the mp4 using ffmpeg. This creates a much larger, uncompressed file that is much easier for your video card to manage. The end result is that there is little or no lag when moving frame by frame, which really speeds things up. Do this. It’s totally worth the time.
I know it’s not super-popular, but I like to run through my scenes with a joystick first at about 35% and get a general layout. I then go through mine twice more to adjust timing and depth in a frame-by-frame manner, but you may find that your results with a single pass are good enough for your purposes. XBOX/PS joystick control is an often overlooked and very valuable feature of the application.
Blowjob scenes are always tough, but you might find that between the two it gets easier, and you might just get sufficient results for your purposes by just using a joystick in default mode.
I know it’s not much, but I hope it helps!