Timbres of Heaven Balancing Dynamics

So, I downloaded the timbres of Heaven soundfont, and right away, I noticed that the sounds are significantly louder than the chiptunes, guitars, and musescore general soundfonts. I tried messing with them in the mixer, but they all seem to either still be too loud, or out of balance with the rest of the instruments. What volume should I set the patches to in the mixer so that it balances out a bit better. Let me know as soon as possible. Thanks.