In this update I've tried to remove the 64 block limit to the height that a player can be launched. So by setting the 'force' variable to the required value, any height should be achievable.

For a 'force' value between 1.0 and 4.0 there is no change between this version and version 1.6, with a height of about 64 blocks being possible.

However values above 4.0 will launch the player to heights in excess of 64 blocks. In the testing I've done, very high values can be a little juddery sometimes but hopefully not too much at lower values.