I see what you were trying to say, but be careful limiting it to 2% of your entire portfolio. If you had $300k portfolio, then you are willing to accept a 100% loss on your $6000 purchase of the $10 stock before it reaches 2% of entire portfolio. I am pretty sure the general consensus is 2% of the position not portfolio.
Just be careful swing trading TSHO right now. The spread is wide and the volume is anemic and not the perfect candidate.