Dual wielding Assassin
Weapons: Blade's Sword in one hand and Blade of Woe or Mehrunes' Razor in the other.
Secondary Weapon: Nightingale Bow - Deadric and Ebony Arrows
Armor: Ancient Shrowded Armor
Skills: One handed Weapons, Archery, Sneak, Alchemy, Speech (all bartering perks)
So.... 31 levels above the max scaling. Tricked out with superbest equipment. I'd say "laser-like focus on just a few skills" except for the part where to be 81, you need to have every single skill at 100......
Honestly, I'd be surprised if you DIDN'T find it easy like that.
The TES games have never been good for the "min/max & powergame" style. Do that, and yeah - you get overpowered. That's just the way it is. Some games cater to that playstyle. Others don't... they cater to "normal" play, not powergaming.

Me, I thought I played my first character "normally" (at least, normal for me). I used a variety of skills, I assigned perks by what seemed interesting & useful at the time I leveled (rather than having plotted out every perk beforehand), I didn't powerlevel any particular skill...... character used about a dozen skills, and the first one to hit 100 was Smithing - at level 48. Besides Smithing, no other perk tree was "maxed out". The average "main skill" I used had ~6 perks spent in it. Honestly, I didn't find many of the top-tier perks to be very compelling.
Playing on Adept/Normal/Average, I was challenged from lv10 to the high 40's. Stuff killed me, and I didn't kill anything "in seconds" except for stuff that I massively out-leveled (like basic bandits and draugr).
Not sure what to say. I don't particularly find the playstyle evidenced by your character to be "normal". At least not for an RPG. Maybe for an action hack/slash game like Diablo 2, one where your only goal is Moar Power? so that you can fight off the infinitely-scaling waves of mooks.