Hi,
I think applying two months later will not really change anything.
Three key facts that won't help your TRV application:
1. You stayed for 7 months on your previous visit.
If you had visited for a couple of weeks on your previous visit.... you would be able to convince the visa officer that you are a *genuine visitor* for your next visit.
2. You are married to a Canadian PR + no spousal sponsorship application.
3. You have moved/started working in the UAE quite recently.
I would not advise applying for a TRV presently. It's your choice though. You can try the Dubai>> Canada>> US>> Dubai strategy + demonstrate other strong ties
Hope you get a TRV