On your first point, an injured Laxus who had fought at length with Wahl defeated Hades. I guess that doesn't count either?
Also, Laxus not being able to get a decent punch was because Wahl was matching him in speed and strength. Otherwise, we would've had Laxus hit Wahl numerous times but the hits would be ineffective due to Wahl's Lightning immunity. However, we never saw Laxus overwhelm Wahl like this. Wahl doesn't negate Laxus speed or strength. The mere fact Wahl wasn't getting tossed around or continually hit is proof that he can indeed keep up with Laxus. The fact that he could get Laxus serious and then have him shocked at his attacks is proof of his strength.
So now Neinhart is fodder? This because he got taken down by Grand Chariot which enveloped the skies? Are you implying Kyoka can take that?
Also, there's no reason to doubt that his summons are as powerful as usual. That's pretty baseless. It's obvious the summons can't keep up with the current crop because they're far more powerful than the time when they last fought.
Besides, even without considering Kyoka's summons, we still have Pre TS Erza's battle against her as reference.
PoF or not, Pre TS Erza bested Kyoka and I'm sure it's reasonable to say that Erza is stronger than she was then. Kyoka's enhancement isn't limitless or at least, she can get defeated despite it. Even if Kyoka could bridge the gap between her and Wahl with enhancement (which she can't), Wahl would've disposed of her long before she could do so.
Those are snippets of different times Wahl attacked and matched Laxus. All showing that Wahl is very much capable of doing damage to someone of Laxus's caliber. In assault mode, Kagura remarks that Wahl scorched the sky itself. And this wasn't even the strongest attack he had. So what's Kyoka going to do about his speed? His strength that can do that much damage to Laxus? His attacks that leave S-class mages gaping? His etherion?
We saw Erza fight Ajeel and basically lose. Or would've if it was just one on one. That's another reference point. If PoF was always enough, then Erza would've won that battle without needing help. But she did need help. Twice. First time was when Wahl got distracted and second was from Jupiter. Wahl is likely stronger than Ajeel but even if someone were to argue that he isn't, he definitely won't be far off. If Erza could've even best Ajeel alone at her current strength, why does Kyoka even stand a chance against an enemy of that caliber when she lost to a weaker Erza?
PoF Erza isn't unbeatable. We know this kicks in when she's about to lose but even with Ajeel literally about to kill her, she could do nothing except use a beacon for Jupiter to target and after the fight, she collapsed. PoF Erza<Ajeel and this is a stronger Erza as mentioned before.