I have been on pointes for about 5 years now, I had strong feet but now they are stronger and pointe shoes are only lasting around a week or two pushed. They are soft after 15 minutes of dance. I had Bloch Asperation and loved them - they look amazing on my feet but i cant afford to buy new ones every week. The Bloch store recommended some and my local dance store got them in, I now have Serenade strong, but I'm not all that happy with them, and they are soft after 2 weeks. I do about 2 hours of pointe a week.
What pointes would you recommend, I have wide feet also and high instep?
I must say I'm scratching my head as to why they recommended the Serenade. If the Aspirations were the right shape for your feet, then the Serenade would be totally wrong! Feet can change shape as you progress with pointe work, but the Serenade is a lower profile than the Aspiration and it's highly unlikely your foot would've lost volume.
When you say your shoes are "going soft", I assume you mean the shank rather than the box or platform. If that's the case then it's worth trying a shoe with a stronger shank, but Bloch doesn't have one in your foot shape - which is probably why they gave you the Serenade as a "make do", but it's really not good enough. I would suggest trying the Russian Pointe Brava.
Some other points to consider:
Breaking in - if your shoes are too soft after 15 minutes of dancing, I wonder if you're breaking them in too much before you wear them? When you break in your shoes, you're actually beginning the process of killing them! The trick is to do just enough to make them wearable and no more, using the method described in these videos.
Rotation - at this stage in your pointework, you should always have at least two pairs of shoes, and alternate them. If you wear the same pair for every class, I wouldn't expect them to last more than two weeks.
Make sure each pair gets at least 24 hours to air dry before you wear them again, and preferably longer. If you take a class or rehearsal that lasts more than an hour, change to a fresh pair of shoes halfway through. I know it sounds expensive to buy two or three pairs at once, but each pair will last a lot longer, so it will work out cheaper in the end.
Technique - occasionally, I come across a dancer who thinks she destroys shoes because she has strong feet, but in fact it's weak or lazy leg muscles that are causing the problem. Legs that aren't pulled up properly will bear down on the shoe, causing it to give way faster. This might not be noticeable in beginner pointe work, but as you do more advanced center work, the stresses on the shoe become too great and it breaks down. Have you talked to your teacher about your shoes? Perhaps get her to check your technique?
A Last Resort
I hope some of those suggestions help. If all else fails, ask your teacher whether she will let you wear Gaynor Mindens. It's important to ask, because some teachers don't approve of them. They have so many options that I wouldn't recommend getting your local store to order them in. Instead, go straight to Gaynor Minden, and use their very detailed fitting questionnaire. When you fill in the details of your existing shoes, use your Aspirations because those worked for you - not your current shoes. Good luck!