Galaxy s2 sch-r760 3g question

[bryan beard]

I just recently got my s2 flashed to straight talk and i am supposed to be using verizon towers and we get really good service here but my 3g is in and out and keeps dropping out. I guess you cant run just off the service bars cause those are usually full is there any way i can get my 3g stronger or is it somthing wrong with my phone we used to get good 3g data.