You should issue each founder a number of restricted shares or membership interests and file an 83(b) election.
Next, vest one share for you, which will give you 100% controlling interest.
Next, use the Slicing Pie model to determine how the rest of the shares will vest. This will ensure that each participant vests exactly what they deserve.
Slicing Pie is a formula that will vest the shares based on the fair market value of each person's at-risk contribution of time, money, ideas, etc. The formula gives each person a % of the equity that reflects their % of the at-risk contributions.
If you want to know more, email me through SlicingPie.com
and I'll send you detailed instructions.