Maybe start by seeing if your wax can be applied any thinner , some waxes are thicker in consistency and tend to load up the strip too quickly. It may be that you can adjust your temperature of the wax and get it a bit thinner (but check its a safe working temperature) or you might want to consider another wax from the brand that you use that may be applied much thinner than the one you use at the moment. My personal choice is an xtra thin wax strip, I much prefer these rather than some of the thicker versions, most companies offer the standard one and then a thin wax strip. Sometimes just making a few little changes may make it a whole lot easier for you...
Good luck Jack