Can I return to Thailand on a visa exempt after multiple entries and exits?

Sorry for the long post... I'm a bit worried about my next steps into Thailand, do you think I will be OK?

I entered Thailand last December on visa exempt, and stayed for only one week - I entered just to begin my trip through Laos.

Then, I entered the kingdom at the end of January on a SETV, which I extended.

I went to Vietnam (April) and stayed there for one month. Then, I came back to Thailand (May) on another visa exempt, which I extended.

After that, at the end of June I came back to my home country (Spain) to take care of my business here - I have a little business in Spain.

Now I'm going back to Thailand on September, with a new visa exempt. After 20 days I'll travel to Vietnam (I have already bought my plane tickets) and I'll stay around 20 days in Vietnam. After that, I want to come back to Thailand in another visa exempt.

In September I'm going to apply for an ED Visa (I have already chosen school) so in October I'm coming back to Thailand just to get the paperwork and fly out to Vientiane to get the proper Visa.

All my past and future entries in Thailand were by plane.

I'll have proof of funds in cash and flight out, but not proof of stay because I'll stay in the same condo as last time - and only have an email from them confirming my arrive, but not a proper booking.

Never did a border bounce, each time I went out of Thailand I stayed at least one month out.

Do you think it'll be OK?

I prefer to avoid to get a SETV in my country because going to the Embassy or sending my passport to them requires an absurd cost because I live far away from the Embassy - around 100€, plus the cost of the SETV.

Thank you so much in advance :)