Drop the Genestealers completely. If there is an army castled up so completely for you to be anywhere near them, they can and will blast them off the table Turn 1. They will be COMPLETELY unsupported and most things that can't hurt the Flyrants will be aimed at them simply because they don't have Stealth or decent Armor. Too many points wasted sadly.
Flyrants need Electroshock Grubs. These are a friggin amazing addition and as you get better with flying them, you'll get better at engaging multiple targets with a single model and deal maximum damage. Nothing like stripping three vehicles AND occupants of a few wounds. My favorite game was against Orks doing this, cause he had the bodies to not feel like he was getting boned by an overpowered beast and I got the enjoyment of wanton slaughter.
The Carnifex would do better with Bioplasma. It doesn't replace a set of arms so the Carnifex is still able to get the maximum attacks in Assault where you want him. I've run one like this a handful of times and it works well enough. It's very close to the old Screamer Killer type from 2nd Edition. Another thing to consider is the Forge World variants simply because they look damn good. The Stone Crusher doesn't have many more benefits, but they look the best out of the modern line.
Other than those things, the list is decent enough. I still wouldn't call it competitive in the current meta, but it's not far off. The only way to improve that is by dropping Deathleaper, three Lictors, Carnifex and Stealers for a Leviathan Detachment with Mucoloids and more Flyrants. Which I call a boring list. This has enough flavor to stay interesting in my opinion. I might also look at more Rippers so you can have Obj Sec follow the Lictors in when and where you need it but it isn't NEEDED. Most lists do just fine with the two broods of Obj Sec.
Out of curiosity, have you looked at #Lictorshame yet? It was a major tournament winning list twice in a row with a similar concept. It was before the new Eldar and Space Marines, so I don't know if it still performs as well, but it proved how good the 'bad' units in the Nid codex could be with a very overlooked synergy pattern. If you haven't looked at it, I definitely suggest you do because I'm getting the same vibe here.