The spawn timer should not be changed at all.
I cannot stress this enough, and I don't want to sound pompous and say I know more than the other voters, but I agree 100% with Activate - please do not vote to change it if you're not a regular on the server (and by "regular" I mean you play on the server for several hours each week). I almost never see any people reporting problems with the spawn times on Egypt. Also, I already find it almost impossible to be successful attacking as it stands now because it's very hard to make successful pushes on the maps. Let's be honest, it's easier to defend on Egypt, so why would you make it even easier? The only time that I EVER see the attacking team have offensive sweeps is when the teams are ridiculously stacked, or when a defending team forgets about the possibility of a spy or scout back-cap.
The spawn times do not need to be changed AT ALL. Egypt is almost always full, and has been so for the entirety of my (almost) year as a member of the TF2 division. In all honesty, I can only see our current regulars on the map leaving over time if the spawn times are changed. One either has to be a seasoned pro at TF2, or have a stacked team on his/her side to be an abnormally successful attacker on that map.
Oh, and to prove my point I'd like everybody to think about this:
Tuomi, Snail breeder, Picklefishlips, Duce and Decipher all on the defending team (please do not say this is unrealistic, as such a team composition happens all the time) while you're trying to win as an attacker. If you do not have equally great players on your team with a lowered spawn timer for RED you will lose; I'm 100% sure of this.
Also, please don't say that all you need to do is have an uber and spam to win a round on offense on Egypt. I once had several medics on my team while attacking, all of whom had an uber at one point, and we still didn't win! Now, I like to think that I'm a solid player, at least as far as "pub" servers are concerned, but even with many people being uber'd and taking down a ton of sentries and players it still wasn't enough. Hell, even when we have Rene on the offensive team we often lose, and he ALWAYS has at least ONE uber; PLUS he vocalizes strategy to help the team win and probably scores more points than anybody else on the entire server in a single round due to all the assists he gets from killing the RED players, and there's still a strong possibility to lose!