Maybe this has been covered but in the 1/2 games i play $5 button/utg straddles are pretty common.

So far I just treat is as if were playing 2/5 but i usually lower my initial raise sizing to 3x instead of my standard 4-5x and add one for each limper. So with a button straddle to $5 and 3 callers I will make it $30 to go. Is this a sound approach?

When facing a straddle and limps my ISO range is pretty darn tight given how bloated the pot will be and my raising/ISO range is almost always for value , but I've noticed I'm almost always getting folds when i make it $30-$35 preflop , which I guess is an arguement for not narrowing my ISO range if I'm picking up all that dead money a good % of the time , but on the other hand since it's almost always been a value range it sucks rarely getting action.

When I'm raising a straddle-pot anywhere from MP-BTN, I'm generally more conscious of the player-types in the blinds. I often ask myself, before raising, how I'll respond to a 4-bet, as there's extra-incentive for the blinds to squeeze. Generally, this means I will narrow my ISO range, as you have been doing. I'm surprised, to be honest, that you're rarely getting called in these pots when raising a standard amount from this position, as I find the limpers usually call, if the straddle or blinds don't raise. So, my feeling is that this problem you're encountering is less about bet-sizing and more about your table image. Maybe if you squeeze from the blinds occasionally, then you're more likely to be 4-bet/or called when you have strong hands.

Yeah I'm a bit surprised I haven't been getting action either since I rarely get folds to 3bets ($50 3bet pre got called in 4 spots today , sadly to say my QQ hit a flop of Axx and i c/folded) and routinely get Q9ss to limp/call from EP to my 7-8x ISO.

My thought is , more so with button straddles than utg straddles (since blinds act first , and hey put a chip in already im not leaving now) ,which leads to utg's range limp range being more like his mp limp range and mp limp range being more like his button limp range and so on (assuming button straddle since i feel the blinds usually set the wave off) and get a lot of reallll junky hands just coming along to see a flop and $5 is a cheap price , while another $25-30 , well that's a little steep.

Than again that's kind of conflicting with what i say about my 3bets routinely ending up 3way to the flop , but in that case a lot of the times I'll 3bet after a raise and call , and i mean once it gets one caller the following guys aren't folding to 35 more when they already put 12-15.

I'd advice to raise a fixed amount like 4x+1pl, because this is autopilot. Always think what are you trying acomplish and raise accordingly. I have a bit different position, because, depending on a table I'm raising 30-100% of my Buttons, but the approach is the same what do you want?

I'm more accustomed to UTG straddles, but generally the dynamic is centered on anticipating a re-raise (4bet). So, if I'm very strong (QQ+), my bet-sizing is concerned with inducing, especially as the 4-betting range is wider than usual in these situations. In terms of bet-sizing, I would suggest larger for the low-mid part of your raising range and smaller for the higher-end on occasions (but only when the dynamic is right). I'm only suggesting this because of the limp/folding dynamic you describe and it really is a strategy that is table specific.