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I've found with my h4 conversion (by bosch) that the low beams are so-so, but the high beams are great.
When i put the lever half way, so both of them are on, the lighting is perfect.
Anyone know how to jerry-rig the high beams so the highs AND lows go on?


That is known as "flash" mode. Problem with long term use of flash mode is that the bulb and/or housing can overheat and cause problems, since you have both low and high beam filaments on at the same time.

What I do similar to that is set my fog lights up to stay on with the high (or low) beams. With the fogs filling in area just in front and to the sides of the vehicle and the highs down the road, it works fine. Only do so out in the back country, though.