Is the iPad housing bent or dented in any way at the bottom of the iPad?
If not have you tried using some B7000 liquid glue to hold down the glass at that area? You can use that by applying some under the glass or gap at the bottom then applying a bit of pressure and clamping it down with some scotch tape. It’ll take at least 24 hours for the glue to set but it will do the job.
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(Edit: Forgot to say this but wipe the excess glue before letting it set for a cleaner finish)
I wouldn’t worry about it getting it very flush because it’ll be more hassle to get it flush as you’ve seen.
Is the iPad housing bent or dented in any way at the bottom of the iPad?
If not have you tried using some B7000 liquid glue to hold down the glass at that area? You can use that by applying some under the glass or gap at the bottom then applying a bit of pressure and clamping it down with some scotch tape. It’ll take at least 24 hours for the glue to set but it will do the job.
I wouldn’t worry about it getting it very flush because it’ll be more hassle to get it flush as you’ve seen.