This member has never played live but online or live opening late to steal blinds; your story is being read for what it is. Try stealing in early position (early position is where I buy a lot of blinds and steal on the flop if they call, or delayed blind steal on the turn for example, with hands that play well on flop.) instead as an example, this is where most people will give credit for having a hand and this will help mix up play then add late steals occasionally. They are the ones out of position making a move pre with an abnormal amount of chips, wait to set them up because if they think you are only stealing as your post suggests; they will repeat this mistake and eventually you will catch them be patient if this is your goal to run a race with 20-30bb pre-flop.
This member has too much skill to look for reasons to run 30bb pre-flop. My comfort zone is 30bb in MTT and cash games I am looking to play for stacks otherwise, only interacting to get information and set future plays up for a big payoff. This player does not often look to run a race pre unless I have the right hand against the right player and the prior information supports this high variance play. This player looks at people who look to put pressure on me with an abnormal amount of chips as a leak, just the same as someone who is looking for reasons to call those plays. This player is looking to dodge or control variance by completely understanding the situation and my opponent (‘s) holdings.