Maybe apply in the middle of April. Most Visa will be valid for 3 months from the date of issue. You must enter Thailand within the validity of the visa which would be latest by midd Juli.
From what I understand, It's only businesses that fill out the TM 30. Many of the privat landlords never heard of that requirement. (In order to register for the TM30 online portal, you need to have a business number)
Whilst a tenant, he can't file a TM30 but fills out a TM28 if the landlord has not filed a TM30.
Further more, my understanding is that you only need to file a TM30 (TM28) if you permanently change address or trav to a different province, not if you just move temporarily.
If you enter Thailand on a Multiple NON-xx Visa, you get a stamp which allows you to stay 90 days, not 365 days. 365 days is the Validity of your Visa not the permitted length of stay.
What did you do after the 90 days? Did you go for a border bounce or do you get extension of stay?