Apparently this isn't a good idea. I asked this about a month ago and was told by Cove, I believe, that doesn't like people doing this with their cards.
I had some payments declined/on hold because they suspected fraud or something along those lines. The bill was about 55k and I have a 15k limit so i had to split the bills to 14k payments. Paid the bill and transferred money straight away into the explorer card so I could do another payment the next day. I tried to put another payment the next day once i saw my payment went into the card. However my payment got denied. Thought the payment would need another day to change my available funds or something so waited another day. Tried the payment the next day and denied again so I called up Amex who then told me it was on hold. Got it all cleared up and working. Then it happened again on the 4th instalment.
Mine's currently linked to Ascent. I think I'm going to keep my explorer linked to ascent as I don't want to lose the 2ppd even though the 100k pts is very enticing, which was the whole reason of applying and the 1.5ppd. I think 2ppd is much better in the long run.