Not satisfied with bottle?

Dad has been willing to pitch in and give baby a bottle every now and then to give me a break but after taking a bottle baby is unsatisfied and still wants to nurse. Most of the time he won’t even finish the bottle though. I have a fast flow/forceful letdown. Do you think the bottle is too much work/too slow of a flow for him? He usually only nurses for 10-15 mins, but with bottles it takes him quite a bit longer. I have been hesitant to try a faster flow nipple for fear of him wanting that over the breast... any tips? 🤷🏼‍♀️