The lovely ladies above have already given all the tips I would have suggested, and then some! But just to say, it DOES get easier! We had a similarly high/bubble palate and a tongue tie (which wasn't picked up by the first 3 midwives and health visitors that looked into it, but I insisted it was there and asked for a referal to the Tongue Tie clinic). Coupled with nipple thrush which was excruciatingly difficult to get rid of in the early days, I can honestly say that the first 4 months (urk!) of breastfeeding was varying degrees of torture!
And then - it all changed.
The thrush was cured, the tongue tie snipped, he grew, we saw the cranial osteopath, his palate changed shape... and it's been wonderful since!
The mums in my NCT group were starting to wean their babies and most were finished bf by 6 months. After all that effort, and only just starting to really enjoy it, weaning was the furtherest thing from my mind!
We are still breastfeeding 9.5 months down the line.
It DOES get easier!!
So, I would definitely ask for another opinion about the tongue tie, and try bf before bubs becomes frantic. I personally have always worried that mixed feeding is a difficult slippery slope to manage (but am aware that other mums have managed it)....
Best of luck!