Do you think it would help if you warmed the fluid up before giving it to Max? I've seen it make a difference in some cases. I gather that room temperature fluid flowing into the cat's system can be uncomfortable because it is much cooler than the bodily temperature.
Put the fluid bag in a sink basin or bowl full of warm water, enough to cover it, for a few minutes. Then, when the bag feels warm (but not hot), hang it up again and administer the fluid to the cat.
Sending prayers for you and Max as you both work so hard to make this time comfortable for him.
Hugs and purrs,
Pat and cats
P.S., I also lit a candle: http://www.gratefulness.org/candles/...ng&cid=8749714