Help needed with correct VSR Spring

[Snakeeyes75]

Hi all, so here's my current problem that's driving me up the wall.

 

I had a few months ago my TM VSR Gspec upgraded by ASPUK. (Advanced upgrade that includes: Steel Cylinder, Cylinder Head, Piston, Spring Guide, M150 Spring, EZ 90 degree trigger and a Type B hop arm.)

 

When I first got it back I took it to my local range (Ford) and I was amazed as it was hitting 90 meters + with .43's. (Much to people's disbelief on the forum lol) anyway, I took it to 4 skirmishes and noticed each time that the range was slowly decreasing. I realize that the spring will bed in and lose power over time so I chronoed it and was alarmed when it read 435 fps. (I paid for 500). I stripped it down, and realized that the cylinder head was a bit loose so after tightening it properly it chronoed at 465 fps, not bad but I was expecting more. I've been in touch with Darren and he sent me out another M150 and for good measure an M160. I first put in the M150, back at the range I was hitting 90 meters again but after half an hour it was decreasing and I chronoed it at 480fps (It was firing at 505 when I first got there). I've now swapped to the 160 which chronoes at 530, after half an hour's shooting it's down to 516fps but It doesn't want to go lower than that.

 

With all that in mind I've now decided to try a Laylax M170, I was told to try that (Over the 150) and after it's bed in see what it's reading, If it's still too high then cut a coil off.

 

My question is, does that all sound like a good idea? I'm hoping to achieve 490 fps at least but I just don't know whats going wrong, if it's ASPUK's springs then fair enough, I've not seen any other people complain but like I said, the range dropped really quickly, I was only getting 50 meters reliably by the time the power had dropped.

[Snakeeyes75]

Anyone??? I've put a Laylax M170 in, it's now chronoing at 516 fps. What do I do now?

[Josh95]

have you checked your air seal, maybe you have a bad air seal and its losing a lot of power

[Snakeeyes75]

have you checked your air seal, maybe you have a bad air seal and its losing a lot of power

 

Yeah, all nice and airtight. The only time it lost a stack of power was when the cylinder head worked loose (I bought the proper tool to tighten it). The ASPUK head has an O ring plus I've PTFE taped the thread. I'm about 90% convinced that the problem has been the M150 ASPUK spring. Ive been bold and clipped 1 & half coil from the Laylax M170 and it's reading 490-500.6 (I put 100 BB's through it first). The question is now, how much will it lose?