As said before, I have my doubts that we will be able to create a bootstrap that works for everyone on every platform. It should work with the -loadblock parameter that I posted (at least, that's what I have tested for myself with testbugs bootstrap).

Some coins have a -detachdb commandline switch for the daemon, that allows to create bootstrap-able copies of the chain - our wallet misses that currently. I can't say if that's the cause for your troubles or not but I create regular bootstraps for another coin with that feature and never had any issues or complaints so far so I am concluding that is a factor.

Anyway, if the -loadblock doesn't work for you, you are probaly left with the choice of synching from network - which I believe should be much faster than you seem to experience currently. I would rather try to find out why synching is so slow for you and improve that for everybody instead of further doing blindshots with huge bootstraps blobs.

Would you mind to PM me the complete output of getpeerinfo from your wallets debug console and also an estimated rate of how many blocks you see downloaded per minute (just to get an idea and comparison with the speed I am seeing when synching from scratch)? Also maybe the rough spec of your machine (RAM, CPU type).