First of all thanks for your respond! :)
Next I am sorry for my english but I came from Czech Republic, so english is not my native language.

1. Well, I start with Doran's Ring in 5v5 Ranked and Solo, but in 3v3 I don't think that it is the best way, thanks to the heal in the middle of map. Almost everytime when I get low on mana, there spawns a heal and mana is back. Of course if you wouldn't take that heal, that would be a problem and Doran's Rings would be useful, but they cost so much that it delays your Nashor's Tooth which is in my opinion better.

2. Well, there was always a penetration cap. When you look in game and look at your stats, the penetration will stop at 39%. Yasuo have it because of his ability but thats other thing. Penetration cap is 39% at last I though. I know that it can go below zero, but that will do only little damage. Better is buying some real damage item.

3. And the masteries, you are right. For Kayle that scales moustly ability power (as I did) is better what you write, but just today I updated the guide, because I started to play with Hextech gunblade instead of Lich bane and now the talents are more useful.

So I see a few things in this guide that I will have to contest. First, boots start is one of my biggest pet peeves when I'm playing with randoms, but even more-so when people lead others astray in guides. This is meant not to bash you but to hopefully improve your play. You'd be far better off starting with 2 Doran's Rings which will give you nice AP, health, and mana sustain. Generally you can go B at 1:02 to get a Health Pot for health sustain. It will, theoretically, delay your Nashor's Tooth but will make you do much better in lane and should lead to more kills, farm, etc.

Second, since when is there a cap on % based penetration? I mean Yasuo's ult gives him 50% armor pen against whoever he keeps up. Heck, Void Staff + Devastating Strikes is 41% magic pen so even if there was a cap, it wouldn't be 39%. Also, if you stack flat penetration from runes and Sorcerer's Shoes you can sometimes get people below 0 MR which makes you deal MORE than true damage. Kayle does have low AS early so I do like AS Marks but I feel like Greater Mark of Hybrid Penetration can also have its place in an alternative runes section or somesuch. I also feel like Sorcerer's Shoes are optimal, even in an attack speed / AP setup.

Next, I feel that a 25/5/0 mastery page would better suit your Kayle setup. Warlord is pretty much useless for your build as it only count bonus AD and the only place you get that is your other masteries and Guinsoo's Rageblade. Not really enough to make 5% do much. Also, Kayle counts as ranged when you activate E so I feel like cutting Warlord , Double-Edged Sword , and Phasewalker for defensive masteries can help a bit with early survivability.

Final thing is that I feel that you should go through and proofread your spelling and coding within the guide. There were a few things that could use touching up.

I hope that this wasn't offensive but helpful and that you test these things for yourself.

gl and hf.