Stick with the 1 sen opener, its easier and works well on most things. Try the 3 sen once your more comfortable. Here's a few other tips:

- Try to adhere to the 35 rule for Kenki. Meaning, No Shintens unless you have at least 35 Kenki. This puts you one positional combo away from the 20 needed for Kaiten.
- Make sure you are doing the positional requirements. Gekko - behind, Kasha - flank. These give bonus Kenki which means more dps.
- When you have Hagakura available try to use it with 3 sen. Shinten is a more efficient use of Kenki than most other abilities. Meaning its beneficial to give up the Midare to use those 3 sen on a Hagakura.
- Make sure your keeping up all of your buffs. Shifu is the most important one, so prioritize Kasha.
- Kaiten is for weapon skills only and Guren is considered an ability so you cant use them together.

If you have any other questions feel free to fire away and ill answer them as best as I can. I imagine others will do so as well.

Source: iLvl315 Sam main