i ran a 70*25 with some high rise bars on my zoot to great effect. pop up a picture of your current bar+stem, how tall are you? and how much cycling outside of trials have you done?
sent you a message, is it front or rear wheel? when you say feel a little wobble, can you rock the wheel left/right? or does it just bob about as you roll?
your grip strength will improve as you ride more too. look at other levers; the avid SD7 levers offer adjustment that changes the pull ratio; setting it 'low' makes the lever feel quite slack and spongy but you can pull hard on it quite comfortably you need to play with one to get it aha