Any comments to improve this build are welcome.

Just one forma used and no umbra, so easier for lower levels to use.

[Gladiator Vice] for a little speed before the killing starts and then [Berserker Fury] does the rest. Makes this a fast weapon to build up combo stacks fast. [Quickening] is a good substitute for vice, but you lose the 10% crit bonus. (primed) [Fury] is a good substitute for berserker, but you'll lose at least 15% attack speed.

High crit chance with combo multiplier with [Blood Rush] and the 2 gladiator mod bonus. Combo stacks increase status chance with [Weeping Wounds], which then boosts damage with [Condition Overload]. [Pressure Point] isn't required because of this.

Any [Organ Shatter] mod is a no brainer for a crit build, but [Amalgam Organ Shatter] is so great for the [Tatsu]. 5% less crit damage than [Organ Shatter] but the great heavy attack of the [Tatsu] is very user friendly and even better when sped up. Hit it twice for a nice power move. If you understandibly want the extra 5% from [Organ Shatter] instead, the build will have a nice 6x crit damage.

[Primed Reach] just makes everything much easier and obviously [Reach] can be used instead if you haven't got the prime.