Pantheon Build

So I play Pantheon in normal queue all the time and was wondering if there is any way to improve the build I use. Most people suggest building him tanky, but I tend to focus on AD and cooldown (it's way more fun).

I run 9 Arm Pen marks 9 scaling health seals (armor scales very well and passive makes up lack of extra armor at beginning) 9 scaling MR glyphs and 3 AD quints

For masteries it's a basic AD with maybe a few notes like 4 CDR with no Feast or minion attack boost, I also got spell weaving and blade weaving and leave bonus AD boost at 2. plus 9 in defense.

For Items my complete build usually is: black cleaver, last whisper, randuins omen, maw of malmortious, ionian boots of lucidity and essence reaver.

i usually start with a sword, 2 health pots, and 1 mana pot (I play very aggressive and try to harass people out of lane or outright kill them) and rush a brutilizer and ionian boots as fast as possible to get 22 Arm Pen and 30% CDR, next I finish cleaver and then I usually build the rest as I see fit (many times I get a B.F. sword after cleaver and finish reaver as last item)

Build at level 1 has 646HP, 28 armor, 33 MR, 5%CDR, 76 AD and 267 mana The Build at level 18 has about 3.1k HP, 150-160 Armor, 120-130 MR, 40% CDR, 390-400AD and 850mana

The item I think is least valuable is essence reaver, so I save it for last, the life steal and mana steal are usually pretty useless at that point but the 80 AD is nice and the 10% cooldown brings me to 40%CDR on the build. Other 80 AD items seem even less useful on Panth since he cannot crit on any of his abilities unless the target is at 15% HP and then it increases from 150% extra damage to 200%(IE) and his abilities cannot lifesteal (BT). Sometimes I get Mercurial scimitar for extra MR.

at 400 AD (to make math simple) his Q does 225 + 560 = 785 and if an oppoenent is at 15% HP (not counting mastery boosts) it does 1177 damage and with full Armor pen an opponent with 200 armor will be reduced to 66.5 Armor and so will take about 700 damage from a spear when they're below 15% HP (If they have 4.5K HP total they'd have 675 HP).

I figure most champions are either tanky and barely damage the build, or squishy and get nuked into oblivion. The only problem is perhaps teamfights, you have a bit of durability but will get killed pretty quick if focused

Let me know what ya'll think