Audio Manager and ringtone looping

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Hello Guys, this is my 1st post, been lurking here since I got my Athena(tmobile) for £350.00 2 weeks ago. Since joining i have:

1. unlocked my phone via imeicheck = Now able to keep my original 3 mobile No.
2. Upgraded rom = now on WM6, I didnt know at the time but imeicheck superCIDs the phone as well as unlocks 2 for one.
3. Gained knowledge of the best apps to use

Problems
looped a wav file perfectly on pc, but when the phone rings there is 2 sec silence before repeat

trimed audio in HTC Audio Manager/exported to ringtone folder but tones are silent (no audio)

Does having large ringtones slow down the phone are they loaded into memory?

Any ideas