i always found having many flowers/paths laid helped. the game always spawned the cricket in a spot that was empty. i'd just dig around in the few open spots until it finally unearthed the cricket. as for catching, you should always bury the hole after trying to avoid blocks; keeping the net as your next selection tool for fast moving...
I had been dreading the mole cricket, since the game came out. I never could catch one in WW (couldn't catch a bee either). Yesterday, on my first try, I caught a mole cricket. Happy Dance. Having only the shovel & net in your pocket really helps so you don't have to switch between several tools until you get to the correct one. This also helps when catching a bee (which I have done in NL). In WW, I could never switch between my tools fast enough to catch either one. NEW LEAF so much better than Wild World x a million.