JayBot

I use pretty much this exact collection of mods plus about 70 more. Everything works flawlessly. Obviously this is only anecdotal but I see nothing in your client log or my client and server logs which would indicate a problem of any sort. What other information can you give us?
Are you running the server on the same physical system as your local client? How much physical RAM does the server have, or your local PC if both on the same system? It looks like you are giving your client 1G of RAM. How much are you allocating to the server? What server binary are you using? MCPC+? Basic Forge? What is your view distance set to in the server.properties file? When the client seems to hang are you still able to type commands and receive output in the server console? Are there ever any errors/exceptions in the server.log or ForgModLoader server log file? Socket timeouts would be expected if you are getting kicked. Do you kind of follow the direction I'm headed here? Any other pertinent information would be helpful.