Bottle struggles

Chloe

My LO has been taking a bottle since shortly after birth as my supply never really came in. I nurse for a little bit then finish with formula. Sometimes she bottles great, other times she spurts and gulps like she’s getting too much. I’ve tried multiple nipples/bottles and it’s the same. Majority of the time I would say she does just find, but the times she spurts and gulps worries me. I don’t want her to choke,etc. anyone else struggle? I feed her pretty upright already and even if I try pacing her a bit she will continue. It’s frustrating since it’s not every feed