If you want more picante chiles, raise something more picante like a serrano.

You may have been growing one of the may mild varieties of jalapeno.

Agree with willard3. If something like a Serrano is TOO hot. Try a hotter variety of Jalapeno, Like Jalapeno M. I think Biker Billy is also an "above average" variety.

Kevin

Most Jalapenos that I have grown are mild (SHU = 800 ?).
Serrano is very similar to jalapeno but has more heat.

Also, it is usually mild in cooler climate and with lots of water, less sun. I grow jalapeno to be harvested tender green. Never wait for it to turn red.