Higher ABV brews tend to take longer to carbonate than lower ABV brews, regardless of the bottle type.
IF the seals are centered in the top (easy to align when you're closing them when filling) then you should be fine. It also helps if you got brand new bottles when you started, and/or change the gasket when it starts to show wear (cracking and such).
Also, unless all your brews are the same ABV, you cannot compare carbonation times. It typically (key word there) takes 3+ weeks (notice the '+'?) at 70F to carbonate in bottles. Some batches might take less time, others may take more time. My brew-buddy has a stout that took about 5 months to carbonate.
Another factor is how close to the listed ABV tolerance of the yeast was the finished batch. IME, the closer to that number the batch, the longer it can take to bottle carbonate.
IF you want to carbonate fast, or at the same rate for all batches, then start kegging. It really is the only way to have the same time frame there. Or as close as possible to the same since you're NOT depending on yeast to do something, you're forcing CO2 into the brew in order to obtain your desired carbonation level.